From Pune, we were a group of 80 people. It took us about three hours to reach Kamath Residency, at Nagothane. The booking was done through email.
They provided a detailed pdf with breakdown of the expenses and how to pay the advance. On reaching there, we were welcomed with a lemon drink and morning breakfast. With those done, we started with our adventure activities.
The resort contains a artificial wall for rock climbing and rappelling. The wall is almost 3-4 storey high and it is medium difficulty level for rock climbing. We were done with our activities by lunch time and the rest of the time after that was used for playing volleyball, football, cricket and swimming.
The next day we did the water sports activities. White water rafting and kayaking was a thrilling experience. The food has a good variety with a mix of veg and non veg. Overall, we had a great time there. Source - http://www.kamathresidency.com

Source: http://www.kamathresidency.com

Aamby Valley of Sahara Group may be considered.