sala2500
Famous cave temples
Elephanta Island is a small island with famous cave temples and lots and lots of monkeys. You can catch a boat to Elephanta Island on the piers next too the Gateway of India, which I'd recommend because the boat trip also lets you take in the vast industrial expanse of the Port of Mumbai from the sea. You can buy tickets on the boasts themselves, but there are tons of different boats so the best thing is to ask each of them and compare prices.