Gateway of India is the only accessible route to Elephanta Caves. If travelling by local, then CST is the station from where you can travel upto Gateway by cab. From the back of the Gateway, one can purchase a ticket for 2 way journey availing boat service for Rs 180. The last boat to leave from Elephanta Caves is 5.30pm, please note.
The boat ride is a full 1 hr 15 mins journey. On the way only things to do are munch chips and feed the sea gulls, chat n gossip, click pictures or fall asleep!