Gravity Park is a fun amusement park with rides like go-karts, mini-golf, the Rocket and the Skycoaster. Entry is free, so you only have to pay per ride.
Sea Turtle Inc. is a sea turtle conservation center that you can visit with friends and family. Learn about the various sea turtles there and watch them be fed.
The South Padre Island Birding And Nature Center is a nature area where you can look at unique, beautiful birds and alligators. You can look at them over 3300 acres of the boardwalk.