Start your trip in Mumbai by visiting the Gateway of India Monument, an iconic landmark that was built in 1924 to commemorate the visit of King George V and Queen Mary to India. In the morning, take a stroll around the monument and enjoy the views of the Arabian Sea. In the afternoon, take a ferry to the Elephanta Caves, a UNESCO World Heritage site that features ancient temples and art. In the evening, visit Colaba Causeway, a bustling street market where you can shop for souvenirs and taste local street food.
Start your day by visiting Chhatrapati Shivaji Maharaj Vastu Sangrahalaya, a museum that displays cultural artifacts and artworks, including Hindu and Buddhist sculptures, ancient Indian coins, and European paintings. In the afternoon, visit the Crawford Market, a vibrant marketplace where you can buy spices, fruits, and souvenirs. In the evening, head to Marine Drive, a scenic promenade that offers stunning views of the sunset over the Arabian Sea.
If you have extra time, consider visiting the Haji Ali Dargah, a mosque that is located on a small island in the Arabian Sea. You can reach the mosque by walking on a narrow causeway that gets submerged during high tide. If you're interested in Bollywood movies, consider taking a tour of the Film City, a massive film studio that has been used for shooting many Bollywood films.
For a day trip, you can visit the Sanjay Gandhi National Park, a wildlife reserve that is home to leopards, deer, and birds. You can also go trekking to the Kanheri Caves, a group of 109 caves that were carved out of a hillside between the 1st century BCE and 10th century CE.
To maximize your fun, try some of the local street food such as vada pav, pav bhaji, and bhel puri. You can also take a ride in a black-and-yellow taxi or a local train to experience the local way of life.