You can follow this route
Mumbai/Pune - Bhimashankar - Trimbakeshwar - Shirdi - Shanishinganapur - Ghrishneshwar - Ellora - Ajanta - Kolhapur - Pune - Mumbai
If u skip Trimbakeshwar and Kolhapur you ll cover remaining places in maximum 3-4 days...
If you are looking for some adventure and fun you must check out Bhandardara, dist. Ahmednagar, Maharashtra. It's an amazingly beautiful place. There are mountains all around. Bhandardara is situated in the midst of Sahyadri range. You must visit this place once at least. Check out The Land Of Wanderlust (TLOW) website..... https://thelandofwanderlust.com/ For Details please share your mail id or what's app message on +918450977725.
Warm Regards