Sure, here are some ideas...

1. Visit the famous landmarks and attractions like the Gateway of India, Taj Mahal Palace Hotel, and Chhatrapati Shivaji Terminus.

2. Explore the diverse and vibrant culture by visiting local markets like Fashion Street, Chor Bazaar, and Zaveri Bazar.

3. Relax on the stunning beaches like Juhu Beach, Chowpatty Beach, or Gorai Beach.

4. Indulge in mouth-watering local cuisine at restaurants like Mohammed Ali Road, Irani Cafes, and street food stalls.

5. Experience the rich history and art at museums like the Chhatrapati Shivaji Maharaj Vastu Sangrahalaya and the Jehangir Art Gallery.

6. Take in the stunning views of the city and harbor from the top of the Taraporewadi Fire Temple or the Mani Bhavan.

7. Attend a Bollywood studio tour or watch a live Bollywood movie set.

8. Enjoy a sunset walk or take a sunset cruise on the Mumbai Harbour or Arabian Sea.

9. Go shopping at luxury malls like the Palladium Mall or Infinity Mall or explore unique and handmade items at the Chor Bazaar Flea Market.

10. Attend or experience various festivals and events like the Mumbai Film Festival, Mumbai International Film Festival, or various religious and cultural events held throughout the year.