Mustang Island State Park has property on both sides of the island. Boating, swimming, surfing, camping, and fishing is allowed.
For me, this cache completes the requirements for the Texas State Parks Geocache Challenge - 2011. I had to find 8 of 10 caches in 8 of 10 designated State Parks. I put over 870 miles on my vehicle to get all eight. Today, I drove 733 miles to get the last five along with a few other caches.