Morning (The Gateway): Start at the Gateway of India in Colaba. Built to commemorate the visit of King George V, this arch is the city's most iconic landmark. Late Morning (Elephanta Caves): Take the one-hour ferry from the Gateway jetty, crossing Mumbai Harbour to Elephanta Island. Highlights: Explore the 5th-century rock-cut temples, a UNESCO World Heritage Site. The Trimurti (three-headed Shiva) is the site's masterpiece.
Note: Use the tourist train from the jetty if you wish to avoid the initial walk, but be prepared for a climb of approximately 120 steps to reach the main cave.
Afternoon: Return by ferry and enjoy lunch in the Colaba area. Visit the nearby Chhatrapati Shivaji Maharaj Vastu Sangrahalaya (formerly the Prince of Wales Museum) to admire its world-class collection of Indian art and history.
Evening (Marine Drive): Head to Marine Drive (the "Queen's Necklace") to watch the sunset. Stroll along the promenade and watch the city lights come on. Accommodation: South Mumbai (Colaba or Fort).