This is a MUST if you are visiting Singapore. I found this tour to be one of the best value-for-money experiences that I have experienced.
Starting from the on-time pickup from our hotel, the guide was humourous and informative; letting us know all of the options for returning from the zoo if we wished to stay on after the planned departure time.
The tour included everything from the transfers from our hotel to the zoo and return, entry fee and one of the best 4 star buffet breakfasts available. Then there are the Orangutans, what a great creatures, from babies to adults, you are only an arms length away from them (but don't touch).
I have already recommended this to everyone that I have told about our trip; fantastic, thanks.