Morning: Take a ferry from Gateway of India to Elephanta Caves. The caves are a UNESCO World Heritage Site and are a great place to explore and relax.
Afternoon: After exploring the caves, enjoy a picnic lunch on the island. The island has various food vendors and picnic areas.
Evening: Take a walk to Cannon Hill to see a panoramic view of Mumbai's skyline during sunset.
Morning: Start your day at the Hanging Gardens and Kamala Nehru Park. The Hanging Gardens are a terraced garden located on top of Malabar Hill, and Kamala Nehru Park is a children's park with a giant shoe structure.
Afternoon: Head to the nearby Mani Bhavan, a museum dedicated to Mahatma Gandhi, and learn about his life and work.
Evening: End your day at Girgaum Chowpatty Beach and watch the sun set over the Arabian Sea.
If you have extra time, consider visiting the Chhatrapati Shivaji Terminus, a UNESCO World Heritage Site and the busiest railway station in India. A side trip to the Sanjay Gandhi National Park, a wildlife reserve located within Mumbai's city limits, is also recommended for those interested in nature. To maximize your fun, try the local street food, such as vada pav or bhel puri. Don't forget to take a ride on a local train, a unique and affordable way to experience Mumbai.