You can check my itenery for the travel purpose. and can mail me for the places to stay in Sikkim. it costed me only 7500 for the whole trip. mail Id- oshindhanwar25@gmail.com
These are list of place you must visit in gangtok ,sikkim and trust me you will enjoy these trip last year i visited these place and also talking of expenses Gangtok is kind of ok , it's cheap and fun as well.
Banjhakari Falls and Nature Reserve
- Gonjang Monastery - Tashi ViewPoint for an amazing sunset
- Ganeshtok