Best places to visit will be those where you have waterfalls...the period you have mention is the rainfall season and best watergalls like Dudhsagar, amboli in the western ghats will bring a joy to your trip...
These are the best places to visit in July-August in India . Ladakh, Dharamshala, Shimla, Rishikesh, Munnar, Goa, Lonavala, Valley of flowers, Mussoorie.
Maharashtra has some really great options in the rainy season. There are lots of places arnd Nashik and Pune that you can plan to visit. Also, places like pachmarhi, Orchha, Khajuraho in Madhya Pradesh are equally beautiful