Many things .. 1) explore the ancient palaces of the maratha empire they include shaniwarwada . At the centre of the city,this will also give you an opportunity to roam the nearby places .
2)sinhgad fort-close to khadakwasla dam is am awesome weekend getaway for the puneri's . 3) exploring the nearby places such as lonavala,mahabaleshwar.
4) if you got plenty time you can also visit nearby beaches which are very clean and only 4-5 hrs from pune . alibaugh district houses no of beaches that attracts no of people from pune and mumbai