Go for neelkantheshwar its awesome in monsoon
Other options are Sinhagad fort, panshet dam, purander fort, malhargad fort, mastani lake, necklace point many more, if you want detailed information you can check check my channel desichhori on you tube you will find all the vlogs
Sinhagad is a hill fortress and is located well within proximity to Pune. It's really a good place for a day trip. This is the best season to explore all the forts located around Pune and Sinhagad is one among them and nearest as well.
All these places are one destinations in Pune.Shaniwar Wada Palace,Pawna Lake,Appu Ghar,Aga Khan Palace,Mahatma Phule Museum,Raigad Fort,Pataleshwar Cave Temple,Taljai Hills,Kamshet,Panshet Dam.