Singapore and Rio de Janeiro are the only two cities in the world with any significant remaining primary rainforest. Bukit Timah, at about 164 hectares (405 acres), isn't massive by any stretch, but within its borders grow more species of trees than on the entire North American continent. A trip here should start at the Visitor's Centre, which has informative displays about the flora, fauna and natural history of the reserve. Then, walk some of the numerous well-marked paths, and be on the lookout for exotic birds, butterflies, monkeys, squirrels and flying lemurs, as well as unique plantlife. Some of the trails lead to Bukit Timah Hill, the highest point on the island.

There's no doubt about it: Singapore is a busy, crowded city. If the activity becomes just a bit too much, this nature reserve is a great retreat. You may not completely escape civilization (after all, there are over 4 million permanent residents on the island, plus innumerable tourists at any given time), but it's certainly quieter and less populated than the Financial District! Several trails criss-cross the reserve, taking visitors through mangrove swamps teeming with wildlife. Along with a plethora of birds, mudskippers, various shellfish, snakes, monitor lizards and otters make their homes here. On Saturdays there are free guided tours at 9:30am, and 3:30pm. And watch out for crocodiles!