Start your honeymoon by visiting Gateway of India, an iconic monument in Mumbai. In the morning, enjoy the cool breeze and take a boat ride from here to Elephanta Caves. In the afternoon, explore the nearby Colaba Causeway for street shopping and souvenirs. As evening sets in, return to the Gateway of India to watch the sunset over the Arabian Sea.
On your second day, visit Juhu Beach, one of the most popular tourist spots in Mumbai. In the morning, take a walk on the beach and have some local street food breakfast. For the afternoon, visit Prithvi Theatre, a famous spot for theatre lovers. In the evening, enjoy the romantic sunset on the beach with your partner.
Spend your third day visiting Chhatrapati Shivaji Maharaj Vastu Sangrahalaya, a museum known for its exquisite collection of art, archaeology, and natural history. In the morning, explore the various galleries and exhibitions. For the afternoon, visit the nearby Royal Opera House, a heritage site that has been recently restored. In the evening, head to Marine Drive, also known as the 'Queen's Necklace,' for a romantic walk.
On your last day, visit Sanjay Gandhi National Park, a beautiful nature reserve in Mumbai. In the morning, take a guided tour of the park and enjoy a picnic with your partner. For the afternoon, visit the nearby Kanheri Caves, a group of rock-cut monuments. In the evening, head back to your hotel for a romantic dinner.
Other attractions that you may consider visiting are Haji Ali Dargah, Siddhivinayak Temple, and Bandra-Worli Sea Link. You can plan a side trip to Lonavala, a beautiful hill station near Mumbai. To maximize your fun, you can also go for a Bollywood tour or visit a local dance club.