Well, sseamom, I suspect that since the OP is into rafting (as she indicated on one of her other threads) she might want something more durable than stuff designed for lounging on the beach.
Fabric quality and fit matters greatly when you move your body. Some fabrics stretch really badly when they get wet - not good for active butts.
That’s why I recommended things I know would provide great coverage and comfort.
I am not dismissing Target’s swimwear - its fabric is pretty durable, and I have a few of their auits. It is just Target doesn’t always stock boyshorts in their physical stores, so OP might be wasting her time going there.
http://m.target.com/p/swim-short-mossimo/-/A-16444538
I would just order a few online making sure they are returnable.