Bandra- Band Stand, Carter Road
South Mumbai- CST, Colaba, Gateway of India, Marine Drive, Museum
Powai Lake
Worli Sea Face and Sea Link
Andheri and Bandra- Pubs
Juhu- Beach
Versoa- Cafes
Rajiv Gandhi National Park
Byculla- Streets
MS Ali Road
Sorry I didn't get whether you're looking for places in Mumbai or you're traveling from Mumbai to visit places. If you're looking for places to travel to outside Mumbai you've a few options.
1. Mahabaleshwar
2. Alibaug
3. Diveagar
4. Tarkarli
5. Dapoli
6. Saputara
You can visit virgin beaches of Maharashtra. the coastal line of Maharashtra is known as konkan. beaches like Kashid, aareware, diveagar, Ganpati pule, Hari hareshwar, ratangiri fort.
1.lonavala and kalavantin trek with night camping
2. morning you can start to devkund water fall trek till 3rd day morning
try Mumbai Pune travels best and cheap very friendly