If you are using Avgas, double check with the handler the day before that there is supplies at the airport, get it in writing on email. Seen a couple of planes stuck here in Kolkata due no avgas available when they arrive!
Have fun, and watch out for the morning smog for the next couple of months in India, dont plan on departing before 10am in most places as it will be less than ILS minimas. If you need help with overflight clearances for any of it give me a pm I can give you some names and emails of people who wont rip you off from India to Thailand.