Near bangalore, there's hampi u can visit. Near Mumbai, there's alibaug, lonavla.
Depends on what kind of fun you are looking at. By the way all the places I mentioned have both kind of fun, peace as well as parties. Hampi- hippie island have parties. Not been to parties but heard alot about it. And hampi ruins is a relaxing place where you can enjoy sunsets, and amazing architecture. Alibaug/Lonavla you can enjoy and relax at beaches or book a villa and enjoy pool, etc.