Mumbai is a vibrant city with a rich history and culture. Here's an ideal itinerary for 3 days in Mumbai:

Day 1:

Start your day with a visit to the Gateway of India, a historic monument that overlooks the Arabian Sea. From there, take a ferry to the Elephanta Caves, a UNESCO World Heritage Site that features ancient rock-cut temples. Spend the afternoon exploring the Colaba neighborhood, which is known for its street markets, cafes, and boutiques. In the evening, head to Marine Drive, also known as the Queen's Necklace, to watch the sunset and enjoy the sea breeze.

Day 2:

Begin your day with a visit to the Chhatrapati Shivaji Terminus, a UNESCO World Heritage Site and one of Mumbai's most iconic landmarks. From there, take a train to the Mahalaxmi Dhobi Ghat, the world's largest outdoor laundry. Afterward, head to the Haji Ali Dargah, a mosque located on a small island in the Arabian Sea. In the evening, visit the Bandra-Worli Sea Link, a cable-stayed bridge that offers stunning views of the city.

Day 3:

Start your day with a visit to the Crawford Market, a bustling bazaar that sells everything from spices to jewelry. From there, head to the Chor Bazaar, a famous flea market that is known for its antiques and vintage items. In the afternoon, visit the Sanjay Gandhi National Park, a sprawling nature reserve that is home to a variety of flora and fauna. In the evening, head to the Juhu Beach, one of Mumbai's most popular beaches, to watch the sunset and enjoy some street food.

I hope this itinerary helps you plan your trip to Mumbai!