Morning: Explore the two domes, Cloud Forest and Flower Dome, and witness the Supertrees show.
Afternoon: Have lunch at Satay by the Bay and rent a bike to tour the gardens.
Evening: Watch the Garden Rhapsody light and sound show at Supertree Grove.
Morning: Visit the Buddha Tooth Relic Temple and Museum and learn about Buddhism.
Afternoon: Shop for souvenirs at the streets of Chinatown or have lunch at Maxwell Food Centre.
Evening: Explore the colorful streets of Chinatown and visit the Sri Mariamman Temple.
Morning: Go on an adventure at Universal Studios Singapore and ride the thrilling roller coasters.
Afternoon: Visit S.E.A. Aquarium and see the diverse marine life.
Evening: Enjoy the Wings of Time show at Siloso Beach.
Morning: Take a dip in the infinity pool and eat breakfast at the SkyPark Observation Deck.
Afternoon: Visit the ArtScience Museum and see the latest exhibitions.
Evening: Enjoy a luxurious dinner at one of the many restaurants in Marina Bay Sands.
Morning: Take a boat ride along Singapore River and learn about the city's history.
Afternoon: Have lunch at the bustling Clarke Quay and go on a shopping spree.
Evening: Enjoy the nightlife of Clarke Quay and have a drink by the river.
In addition to the mentioned places, other attractions to consider are the National Museum of Singapore, Singapore Flyer, and the Merlion Statue. For side trips, visit the neighboring countries of Malaysia and Indonesia. To maximize fun, try the local food and drinks and attend cultural festivals. Lastly, be sure to keep hydrated and wear comfortable shoes as there will be a lot of walking.