Friends of Laguna Atascosa National Wildlife Refuge sponsor bicycle tours (Bike the Bahia) of the Bahia Grande Unit of the Refuge each month. They begin at an entrance on State Highway 48 near Port Isabel, Texas, and run northward on a caliche road to State Highway 100 near Laguna Vista, about 15 miles round-trip.
Bahia Grande is the largest wetlands restoration project in Texas. Construction of the Brownsville Ship Channel cut off tidal flow to the area a century ago. Over the past two decades, flow has been restored allowing the estuary to thrive. The Bahia Grande Unit encompasses about 25,000 acres. The Unit is generally closed to the public.
At State Highway 100, the group of cyclists stops briefly and then rides back southward to the starting point at State Highway 48. There are no facilities along the way. Near the turn-around point is the South Texas Ecotourism Center (STEC), which would be a better turn-around point as it offers a shaded area and restrooms.