Visit the Sabarmati Ashram - home of Mahatma Gandhi, explore the historical Sidi Saiyyed Mosque, and shop at the Law Garden Night Market.
Visit the Laxmi Vilas Palace - the residence of the Maharaja of Baroda, explore the Baroda Museum and Picture Gallery, and spend the evening at the Sayaji Baug Zoo and Garden.
Explore the Dumas Beach, visit the Surat Castle, wander around the Dutch Garden, and shop at the textile markets for which Surat is famous.
Visit the Uparkot Fort and Mahabat Maqbara - an ornate mausoleum, explore the Durbar Hall Museum, and take a sunset safari at the Girnar Wildlife Sanctuary.
Visit the Jubilee Garden, explore the Lang Library, and shop at the Watson Museum.
Visit the Aina Mahal and Prag Mahal - two ornate palaces, explore the Kutch Museum, and take an evening camel ride in the nearby desert.
Visit the Adalaj Stepwell - a unique water-harvesting structure, explore the Sarkhej Roza - a mosque and tomb complex, and enjoy a traditional Gujarati thali for dinner.
You may also consider visiting the Rani ki Vav stepwell in Patan, taking a day trip to the Statue of Unity, and exploring the beaches of Diu.