Vacation spots near chennai

As a part of new year resolution, I'm planning to travel atleast once a month next year. Please help me find some places, that meet the following criteria, 1. Distance from Chennai doesn't matter, but the place must be reachable (4-5 hrs bike ride or night train from Egmore/Central or direct flight from MAA) 2. Explorable for 1-2 days (Sat, Sun) Bonus: Budget friendly