The Wetland Park of Port Aransas was one of the better of the eighteen birding spots in the town, and supposedly the only fresh water place. There was a lake/marsh like area teeming with birds including flocks of Black-necked Stilts, a Lesser Yellowlegs, a Willet, a pair of Blue-winged Teals, a Marbled Godwit, a Mottled Duck, a Tricolored Heron, and various egrets. Nice spot.
Update: Came back the next day in the evening as opposed to the morning and saw lots of Laughing Gulls, seven or eight Willets, a Tricolored Heron, various egrets, a Marbled Godwit, a couple of female Pintails, lots of Black-necked Stilts, a Red Knot, and lots of Boat-tailed Grackles. This only backs up the fact that this place is great.
And if you're having trouble navigating to this place, it's across from the post office. read more