Botanic Gardens: ride MRT North South Line(Red Line) to Orchard station then walk about a mile
Chinatown: ride MRT North East Line(Purple Line) to Chinatown station
Esplanade: ride MRT North South Line(Red Line) to Marina Bay station then walk for about a quarter-mile
Imbiah Lookout: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Imbiah station
Jurong Bird Park: ride MRT East West Line(Green Line) to Boon Lay station then take Bus 194 or 251 to Jurong Bird Park
Marina Bay Sands: ride MRT North South Line(Red Line) to Marina Bay station then walk for about a mile
Merlion Park: ride MRT North South Line(Red Line) to Marina Bay station then walk for about a mile
Merlion Walk: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Imbiah station
Night Safari: ride MRT North South Line(Red Line) to Ang Mo Kio station then take Bus 138 to Night Safari
Palawan Beach, Siloso Beach and Tanjong Beach: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Beach station then take beach tram to specific beach you want to go to
Resorts World Sentosa: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Waterfront station
Singapore Flyer: ride MRT North South Line(Red Line) to Marina Bay station then walk for about a half-mile
Singapore Zoo: ride MRT North South Line(Red Line) to Ang Mo Kio station then take Bus 138 to Singapore Zoo
Underwater World Singapore: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Beach station then take beach tram to Siloso Beach and it's about a quarter-mile walk from there
Universal Studios Singapore: ride MRT North East Line(Purple Line) to Harbour Front station then take Sentosa Express tram to Waterfront station
Singapore railroad map is below: