A must-visit destination for both amateur bird watchers and professional ornithologists, this tree-studded reserve in far south Texas belongs to the World Birding Center, a collection of top birding locales in the state. With 525 documented species here, this land of cedars, elms, and hackberry attracts diverse varieties throughout the year, rendering each visit a different fowl-filled adventure. A hawk tower ensures sightings of the soaring birds, while another two-story observation tower, hummingbird feeders, and butterfly dens turn the park into a biology lab for all ages. More than 8 miles of trails with bird feeding stations await: Try the 1.8-mile Rio Grande Loop, which has gentle terrain that's ideal for families. A 210-foot ramp hovers above the terrain like a canopy, providing an accessible hiking route for disabled trekkers.