I find TripAdvisor.com a great resource for when I travel. Here is a link for them and what they recommend for Tamil Nadu.
www.tripadvisor.com/Tourism-g297674-Tamil_Nadu-Vacations.htm
What are the best Travel destinations in Tamil Nadu?
For any trip, I recommend checking the weather beforehand. Whether you are traveling to the USA or India, you must dress comfortably in order to have a great trip. Check the weather with https://www.meteoprog.us/en/ and always know what to wear next time.