Take the long boardwalk which crosses the lake and notice the hummingbirds and butterflies. The views from the observation tower are great.
More information http://www.cityofportaransas.org/Leonabelle_Turnbull_Birding_Center.cfm
Address 710 W. Avenue A, Port Aransas, TX 78373, USA
Coordinates 27°49'38.448" N -97°4'41.763" E