Only a $10 taxi ride from Robertson quay, MacRitchie seems a world away from the usual hustle and bustle of Singapore city! We walked to the HSBC treetop walk then back around the reservoir, all in all was about an 11km walk ounce the tree top walk was included. The paths are really well signed and the walking trail is well maintained. We saw many monkeys along the way, maybe 3-4 different kinds, we saw huge lizards (looked like goannas but not sure what they were) and turtles in the park at the end. The walk itself is very easy going, but be sure to bring plenty of water as it was very very hot and humid (as could be expected). The views from the tree tops walk should not be missed....though maybe not for those with a fear of heights!