What are other attractions than Gardens by the Bay that are worth visiting in Singapore?

The other must-see attractions in Singapore are:<a href='/singapore-changi-airport-l36937/'>Singapore Changi Airport</a><a href='/universal-studios-singapore-l4045/'>Universal Studios Singapore</a><a href='/adventure-cove-waterpark-l87277/'>Adventure Cove Waterpark</a><a href='/singapore-river-l20475/'>Singapore River</a><a href='/artscience-museum-l5788/'>ArtScience Museum</a>

What are the most popular Gardens by the Bay tours and tickets?

The best Gardens by the Bay tours and tickets are:<a href='/gardens-by-the-bay-l5785/singapore-gardens-by-the-bay-admission-e-ticket-t289680/'>Singapore: Gardens by the Bay Admission E-Ticket</a><a href='/singapore-l170/singapore-go-city-explorer-pass-choose-2-to-7-attractions-t396446/'>Singapore: Go City Explorer Pass - Choose 2 to 7 Attractions</a><a href='/singapore-l170/singapore-go-city-all-inclusive-pass-with-40-attractions-t396444/'>Singapore: Go City All-Inclusive Pass with 40+ Attractions</a><a href='/gardens-by-the-bay-l5785/singapore-gardens-by-the-bay-national-garden-day-tour-t33094/'>Singapore Gardens by the Bay: National Garden Day Tour</a><a href='/singapore-l170/singapore-marina-bay-2-hour-mini-segway-tour-t142920/'>Singapore: Marina Bay 2-Hour Mini Segway Tour</a>