Kihim can be reached by road or by sea via Mandwa.
This is the quicker way. Ferries can be boarded at Gateway of India, Colaba that reach Mandwa in 45 minutes. Refer to the ferry timetable for launch timings and fares. After you reach Mandwa, board the bus outside the jetty. Fare of the bus in included in the ferry ticket. Get down at Chondi and take a rickshaw to Kihim. Ask the driver to drop you off at Suryodaya Holiday Homes.
Reach Vadkhal junction and drive straight towards Karlekhind. Then take a right at a T-junction at Karlekhind. Then take a right at another T-junction at Kankeshwar Phata. And then finally take a left at Chondi towards Kihim.