When you go in at the gate. You pay an entrance fee per person.
You do it online or at the gate.
If you're only swimming at Mustang State Park, your entry/camping fee includes the beaches at Mustang State Park. They will give you a piece of paper to apply to your windshield. If you are wanting to go swim at Port Aransas, there is a Stripes gas station at the main intersection as you come Into town that sales beach permits for $12. That will allow you to go anywhere on the Port A beaches.
You pay an entrance fee per person over age 12
They sell beach permits on the beach or at the gas stations near there
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