This nature walk was by far the most exhausting and fantastic thing I have ever done. Gear up with enough water beforehand because this 8-12 kilometer hike just to get to the tree top walk is brutal. With many trails to to choose from, all swooning with wildlife from monkeys to pretty large monitor lizards this hike is a must see in Singapore. Monkeys casually were walking right up next to us and swinging from trees. Don't be fooled, their precious faces can turn aggressive in seconds. Be careful not to irritate them. The tree top walk is not considerably long for the distance you have to hike to see it but the whole hike In general is worth the incredible amount of soreness in your legs you will have the next day....only if you don't stay well hydrated! We were on a limited budget so we skipped the Singapore zoo and all the excursions you had to pay loads of money for. This was a much better decision instead. You really get a touch of real wildlife in their habitat without paying a dime!