I am planning a trip in October for my family (we have 2 kids-5&13). We are driving from Oklahoma to San Antonio then planning to drive to the coast for a few days at the beach. Of Port Aransas/Mustang Island, North Padre, or Corpus which has the cleanest beaches? My oldest daighter and I stayed at North Padre a few years ago and found a halfway decent beach- I believe in was within the national seashore boundaries. I really want to find a beach of at least this quality for our trip and would really like to find an even better one. We plan on getting an oceanside rental as well. We don't mind doing a little driving but don't want to go as far as South Padre. Any suggestions?