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 the 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 well known in Singapore. Find all the bus stops, Bus Timings and Fare details at SEAx Bus.
Check with the 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 Conductors also sell tickets for Singapore Zoo and Bird Park attractions and they give tickets at 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 discounts and offers. Do not forget to take the Zoo map from the ticket counter. There is a paid Tram ride available inside the zoo from one station to another. One can take the tram ride without a ticket also ;). Well, the stations are not very far, so visiting all the places shown in the map is feasible depending on how much you are enjoying it.
If you are visiting the Zoo 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 an umbrella as it will be very hot. Singapore weather is unpredictable, so always keep an umbrella with you. Take a water bottle before entering the Zoo, although there are plenty of restaurants in the zoo but they are located at designated areas 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 a good option. Singapore Zoo is very well maintained and one can see White Tiger, Penguins and many more interesting animals.