One can plan 2 to 3 places in one day as the travel time is less in Singapore. Singapore Zoo and River – Night Safari are at same place. They will require around 5 to 6 hours of your time. Night Safari starts from 7:15 pm, so you can plan your time accordingly. I had booked SEAx Bus to reach Singapore Zoo, SEAx bus is very known in Singapore. Find all the bus stops, Bus Timings and Fare details at SEAx Bus.
Check with driver before you step-in the Bus for the location. SEAx Bus service is available for Singapore Zoo and Bird park, and both are in different directions. Bus Conductor also sell ticket for Singapore Zoo and Bird Park attractions and they give tickets on discounted rates. The bus fare is around SG$6 one way.
ADMISSION FEE: You can buy combo of Singapore Zoo+River Safari- SG$33 per Adult and Night Safari-SG$45 per adult. For Night safari you can book the available slots such as 7:15, 8:15, 9:15 and 10:15.
All Combo tickets are available at ticket counters, do check for discount and offers. Do not forget to take Zoo map from ticket counter. There is paid Tram ride available inside the zoo from one station to another. One can take the tram ride without ticket also ;). Well, the stations are not very far, so visiting all the places shown in map are feasible depending on how much you are enjoying.
If you are Zoo visiting with kids, do carry their strollers as you really need to walk too much and kids will not be able to walk that much. Also, do keep umbrella as it will be very hot. Singapore weather is unpredictable, so always keep umbrella with you. Take water bottle before entering in Zoo, although there are plenty of restaurants in zoo but they are located at designated area only.
If you have taken SEAx Bus return ticket, please reach on time to catch the Bus. But, if you are staying to see the Night Safari then MRT will be the good option. Singapore Zoo is very well maintained and one can see White Tiger, Penguins and many more interesting animals.