I must say this question surprises me a little. Personally, I think a better option would be to find something on the edge of the sand (maybe a fence or something) to which one could lock their bike, and just walk the 50 metres or so. I can't quite understand why someone would want to ride on the beach (i.e. the sand) itself. Correct me if I've misinterpreted this one.
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I am clinically insane. I am proud of it.
That is all.