India is really a incredible tourist country but unfortunately I have not traveled a lot in India. I have been to just once to Kashmir and enjoyed a lot here. Summer is best time to visit Kashmir and especially you can enjoy sightseeing in Leh. In my same trip to India I got a chance to visit Mumbai city.
It was too hot in summer season to travel in Mumbai. But still I try to visit all of the major tourist attractions in Mumbai. It was nice experience. Among all of the places to visit Mumbai I visited Gate way of India first and enjoyed a ferry ride in Arabian Sea. Cool, breathing air around the seashore enhanced my mood to travel within Mumbai city. I refer some online Mumbai travel guide websites to get best tourist information about the city. Mumbai is a well developed city and here you will get best accommodation, eat out and transportation services according to your budget and demand.
Following is group of some images clicked by me and my travel companion in Mumbai city. These images will give you some idea about beauty of tourist destinations in Mumbai.
Everything For Best Traveling 
Hi Issac, nice post on Mumbai. Stumbled on your site while doing a search on places to visit in Mumbai. Pictures speak more than the text. You might to like to check out this list of 15 places to visit in Mumbai as well.
Hi Isaac good clicks, in order to beat the heat you may visit the snow world at pheonix or ice bar at Mumbai next time or may plan a trip during December – February the best time and very pleasant climate to visit my city.