This large swamp with mazelike waterways is bordered by mangrove trees, some plumed with huge termite nests. If you're lucky, you may see lazy caimans idling in the water and large snakes hanging from branches on the banks taking in the sun. In the middle of the sanctuary are several islets that are home to Trinidad's national bird, the scarlet ibis. Just before sunset the ibis arrive by the thousands, their richly colored feathers brilliant in the gathering dusk, and as more flocks alight they turn the mangrove foliage a brilliant scarlet. Bring a sweater and insect repellent. The sanctuary's only official tour operator is Winston Nanan.