I would recommend Sri Lanka or Cambodia. These two are growing destinations and will be amazing during December plus cheaper. Within India Gujarat, Maharashtra and most of South India will be pleasant. Happy Traveling!
Hey Rajat, If you want to explore a good place this summer, you can go for Maldives. The cost will accomodate the budget you have. The main things you can explore is 1.Under water diving 2. Explore Vaadhoo Island.3. Boduberu Musical show 4.Diving with Hammerhead Sharks..(Sounds scary but it's fun :) ). All the best for your selection.