I stay away from it because of a somewhat unpleasant memory.. no, it's nothing tragic, it's just that the last time I was there (when I was younger) it was hot and I was completely miserable because there was no respite from the weather. I can't think of Tom Sawyer Island without thinking of it being hot and humid and miserable.
Still I'm loving the picture of the cave.. I may need to brave the unpleasant memories to go see this thing.