Mike,

It's almost EXACTLY four hours from our house in Round Rock to the Island side of the ferry docks. We had the best luck on the channel side of the LONG jetty that runs from the north end of the Port Aransas city park/beach. You can walk out on the jetty for several hundred yards, but we were only out about 50 yards past the edge of the beach. The jetty is constructed of huge blocks of granite it looks like, and this makes for some great little holes/pools between the rocks. Small fish are safely sheltered in there. I'm sure you'll be as amazed as we were to discover just how MUCH you'll find in there. It really was WAY cool.