This wetland reserve of mangrove swamps, ponds and secondary forest is home to 140 species of birds. Thousands of egrets, sandpipers and plovers pass through in winter, but plenty of local species (kingfishers, herons, bitterns) are visible all year round.
Early morning is the best time for birdwatching; there are observation hides, and you can rent binoculars. There are three nature trails (3-7km/2-4 miles long), and you can also spot mudskippers, monkeys and climbing crabs on the mangrove boardwalks.
Free guided tours are available on Saturdays (9.30am). On Sundays the 925 bus stops at the entrance; the rest of the week you have to walk from Kranji Reservoir car park – either via Kranji Way and Neo Tiew Crescent, or via the rugged and longer Kranji Nature Trail. Alternatively, you can catch the Kranji Express bus.