Sure, here are 50 tips and hacks for travelers going to Sri Lanka from India, covering various aspects to consider before traveling. I’ll include relevant keywords for SEO as well.

1. Passport Validity: Ensure your passport is valid for at least 6 months from your travel date. This is crucial for entry into Sri Lanka. (Keyword: Passport validity for Sri Lanka)
2. Visa Requirements: Check if you need a visa to enter Sri Lanka. Indian passport holders may require an Electronic Travel Authorization (ETA) or visa-on-arrival. (Keyword: Sri Lanka visa for Indian citizens)
3. ETA Application: Apply for the ETA online through the official Sri Lankan government website. It's a simple process that can be completed well in advance of your travel dates. (Keyword: Sri Lanka ETA application process)
4. Vaccinations: Consult your doctor or a travel health clinic for recommended vaccinations and medications. Diseases like malaria may require preventive measures. (Keyword: Vaccinations for Sri Lanka travel)
5. Currency Exchange: Convert Indian Rupees to Sri Lankan Rupees before departure or upon arrival at the airport for better rates. (Keyword: Currency exchange in Sri Lanka)
6. Weather Check: Research Sri Lanka's weather conditions during your travel dates to pack appropriate clothing and accessories. (Keyword: Sri Lanka weather guide)
7. Travel Insurance: Purchase travel insurance that covers medical emergencies, trip cancellations, and lost belongings. (Keyword: Travel insurance for Sri Lanka trip)
8. Local SIM Card: Consider buying a local SIM card in Sri Lanka for affordable data and calling rates. Dialog and Mobitel are popular providers. (Keyword: Sri Lanka SIM card for tourists)
9. Transportation Options: Research transportation options such as taxis, tuk-tuks, buses, and trains for getting around within Sri Lanka. (Keyword: Transportation in Sri Lanka)
10. Language Basics: Learn a few common Sinhala or Tamil phrases to communicate with locals. English is widely spoken, but knowing local phrases can be helpful. (Keyword: Basic Sinhala phrases for travelers)
11. Cultural Etiquette: Familiarize yourself with Sri Lankan customs and etiquette, such as removing shoes before entering homes or temples. (Keyword: Cultural etiquette in Sri Lanka)
12. Emergency Contacts: Save important contact numbers like your embassy, local police, and emergency services on your phone. (Keyword: Emergency contacts for travelers in Sri Lanka)
13. Electricity Adapters: Bring a universal adapter to charge your devices, as Sri Lanka uses Type D and Type G sockets. (Keyword: Electricity adapters for Sri Lanka)
14. Medication and First Aid: Pack essential medications and a basic first aid kit for minor health issues during your trip. (Keyword: First aid kit for travel to Sri Lanka)
15. Credit Cards vs. Cash: While credit cards are accepted in major establishments, keep some cash handy for smaller vendors and markets. (Keyword: Cash vs. credit cards in Sri Lanka)
16. Food and Water Safety: Drink bottled or filtered water and be cautious with street food to avoid stomach issues. (Keyword: Food safety tips in Sri Lanka)
17. Travel Apps: Download useful travel apps like Google Maps, Uber, and local transport apps for navigation and convenience. (Keyword: Travel apps for Sri Lanka)
18. Hotel Booking Confirmation: Ensure you have a confirmed booking for your accommodation before arrival. (Keyword: Hotel booking tips for Sri Lanka)
19. Travel Adapter: Bring a universal travel adapter to charge your electronic devices. Sri Lanka uses 230V, 50Hz electrical outlets. (Keyword: Travel adapter for Sri Lanka)
20. Local Transportation Apps: Download apps like PickMe for easy taxi or tuk-tuk bookings in Sri Lanka. (Keyword: PickMe app for transport in Sri Lanka)
21. Dress Modestly: Respect local customs by dressing modestly, especially when visiting religious sites. (Keyword: Dress code for temples in Sri Lanka)
22. Currency Exchange Rates: Monitor currency exchange rates for INR to LKR conversions to get the best value for your money. (Keyword: Exchange rates for INR to LKR)
23. Carry Copies of Documents: Keep photocopies of your passport, visa, travel insurance, and important contact numbers in a separate bag. (Keyword: Document copies for travel to Sri Lanka)
24. Local Cuisine Exploration: Try authentic Sri Lankan cuisine like hoppers, kottu roti, and seafood dishes for a delightful culinary experience. (Keyword: Sri Lankan food for travelers)
25. Bargaining Tips: Practice polite bargaining skills when shopping at local markets for souvenirs and handicrafts. (Keyword: Bargaining tips in Sri Lanka)
26. Local Festivals Calendar: Check if any local festivals or events coincide with your travel dates to experience cultural celebrations. (Keyword: Sri Lanka festivals for tourists)
27. Travel Health Kit: Pack a travel health kit with essentials like sunscreen, insect repellent, pain relievers, and bandages. (Keyword: Health kit for Sri Lanka travel)
28. Internet Connectivity: Stay connected with reliable internet services, especially if you need to work remotely or stay in touch with family. (Keyword: Internet connectivity in Sri Lanka)
29. ATM Locations: Know the locations of ATMs in major cities for easy access to cash withdrawals. (Keyword: ATM locations in Sri Lanka)
30. Respect Wildlife: Follow guidelines for ethical wildlife interactions and avoid supporting activities that harm animals. (Keyword: Wildlife conservation in Sri Lanka)
31. Travel Safety Tips: Stay vigilant in crowded areas, safeguard your belongings, and avoid walking alone late at night. (Keyword: Safety tips for tourists in Sri Lanka)
32. Public Transport Schedules: Familiarize yourself with bus and train schedules for cost-effective and scenic travel across Sri Lanka. (Keyword: Public transport schedules in Sri Lanka)
33. Hotel Reviews: Read reviews and ratings before booking hotels to ensure a comfortable and enjoyable stay. (Keyword: Hotel reviews for Sri Lanka accommodations)
34. Photography Permits: Check if certain attractions require permits for photography and obtain them in advance if necessary. (Keyword: Photography permits in Sri Lanka)
35. Local Currency Withdrawals: Use ATMs in major cities to withdraw Sri Lankan Rupees for better exchange rates than currency exchange booths. (Keyword: ATM withdrawals in Sri Lanka)
36. Mobile Data Plans: Purchase local SIM cards with data plans for affordable internet access throughout your trip. (Keyword: Mobile data plans in Sri Lanka)
37. Cultural Sensitivity: Respect local customs, traditions, and religious practices to avoid unintentional offense. (Keyword: Cultural sensitivity in Sri Lanka)
38. Tipping Practices: Understand tipping norms in Sri Lanka for restaurants, tour guides, and other services. (Keyword: Tipping etiquette in Sri Lanka)
39. Travel Itinerary: Plan your itinerary with flexibility to accommodate unexpected delays or opportunities for exploration. (Keyword: Travel itinerary tips for Sri Lanka)
40. Navigation Apps: Use navigation apps like Maps.me that work offline for exploring remote areas without internet access. (Keyword: Offline navigation apps for Sri Lanka)
41. Traveler’s Checks: Carry a small amount of cash in traveler’s checks as a backup payment method. (Keyword: Traveler’s checks in Sri Lanka)
42. Eco-Friendly Travel: Minimize plastic waste by carrying a reusable water bottle and shopping bag during your travels. (Keyword: Eco-friendly travel tips in Sri Lanka)
43. Local Tour Guides: Hire certified local tour guides for insightful experiences and to support the local tourism industry. (Keyword: Tour guides in Sri Lanka)
44. Travel Photography Gear: Pack essential photography gear like a camera, extra batteries, and memory cards for capturing memorable moments. (Keyword: Photography gear for Sri Lanka travel)
45. Travel Budgeting: Create a budget for your trip to manage expenses efficiently and avoid overspending. (Keyword: Budgeting tips for Sri Lanka travel)
46. Cultural Workshops: Participate in cultural workshops or cooking classes to learn more about Sri Lankan traditions and cuisine. (Keyword: Cultural workshops in Sri Lanka)
47. Medical Emergencies: Save the contact details of hospitals and clinics in the areas you plan to visit for medical emergencies. (Keyword: Medical services in Sri Lanka)
48. Local Music and Dance: Experience traditional Sri Lankan music and dance performances for a taste of local culture. (Keyword: Sri Lankan music and dance)
49. Travel Adapter Compatibility: Check if your electronic devices are compatible with Sri Lanka’s voltage and plug types to avoid damage. (Keyword: Device compatibility in Sri Lanka)
50. Travel Documentation: Keep digital copies of your travel documents, including flight tickets and hotel reservations, accessible on your phone or email. (Keyword: Travel document organization for Sri Lanka)

These tips cover a range of aspects to ensure a smooth and enjoyable travel experience from India to Sri Lanka, catering to various needs and preferences of travelers.