South Padre Island
South Padre Island is part of the World Birding Center. “The nature center offers more than 3,300 linear feet of boardwalk, five bird blinds, and a five story tower with spectacular views of the Laguna Madre, beaches and dunes of South Padre Island, The Gulf of Mexico and the South Padre Island skyline.” “Our board walks and wetlands will provide you with up-close viewing of spectacular wetland birds, migrating songbirds and the island’s dazzling butterfly population.”
Here is their website. Phone 956-761-6801 Map can be downloaded from the website.
According to David and Jan Dauphin on their very helpful site, “The Butterfly Garden, all Boardwalks, and everything on the inside are handicapped-accessible.”