Hi Radhika,
This list of places is about 4 hours away from Mumbai:
1) Sinnar
2) Ojhar
3) Deolali
4) Valsad
5) Guhagar
6) Shirwal
7) Karad
8) Pune
9) Rahimatpur
10) Vyara
Hope this helps!
Regards, Senneil
You have 3 best options nearby if you want to go a hill station the u bust go to Lonavala and Lavasa or Mahabaleshwar which u can visit and enjoy properly in 3 days, ether u can go to Alibag beach, it's peaceful and good place to spend some time with yourself.