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Since this park is 70 miles of Texas beaches, it's good to keep in mind.Metal Detectors
Possession or use of metal detectors is prohibited in the park, in order to preserve cutural resources that are protected by the National Park Service. If you come upon a cultural artifact, please note the location of the object and notify a park ranger
I also found it nice that they openly disclosed this one:
Firearms
As of February 22, 2010, a new federal law allows people who can legally possess firearms under applicable federal, state, and local laws, to legally possess firearms in this park. It is the responsibility of visitors to understand and comply with all applicable state, local, and federal firearms laws before entering this park.