O.K. I assume you talk about the stretch of beach from Padre Island National Seashore towards Port Mansfield Channel. I have driven portions of that beach with my VW Vanagon (not the Syncro kind). It is not that bad. What is a lot better is sailing! Either one side of that narrow island is nice for sailing. Wind is almost always good. Check out the Ruff Rider Race - they sail around the other part of the island - from South Padre to Port Mansfield Channel and back.

Patrick