You can first plan to Lonavala where u will enjoy the rain with scenic beauty of mountains covered with clouds n number of waterfalls.
After that Lavasa is the beautiful city with European touch.
Then you can head towards Mahabaleshwar a beautiful spot with huge fog
In between you can visit Prati Balaji a replica of Tirupati Balaji
If you're travelling by private car then start from pune to lavasa. After spending day you can drive to lonavala, where you can find many stay option. Next day you can visit Pawana dam, loins point, bhushi dam and other places too. If you're interested in hike or trek then options like lohgad, visapur and korigad are the best one for one day trek. By evening drive to mahabaleshwar via Pune Bangalore highway, within 3-4 hours you will reach Mahableshwar and Panchgani.