Worth a quick visit on the way in or out of Belmopan is Belize's smallest nature reserve, Guanacaste National Park, named for the huge guanacaste trees that grow here. Also called monkey's ear trees because of their oddly shaped seedpods, the trees tower more than 100 feet. (Unfortunately, the park's tallest guanacaste tree had to be cut down in 2006, due to safety concerns that it might fall.) The 50-acre park, managed by the Belize Audubon Society, has a rich population of tropical birds, including smoky brown woodpeckers, black-headed trogons, red-lored parrots, and white-breasted wood wrens. You can take one of the eight daily hourly tours, or you can wander around on your own. After, cool off with a refreshing plunge in the Belize River; there's also a small picnic area.