"I've been considering beaching it on a sand beach instead of anchoring
off. Is this a good idea?"
Be aware of your tides - you can return to just a beach and no boat
. Other than that, there is no reason you can't beach a your cat. The boat
does weigh more than you think so it's not an easy thing to do. Misc waves from passing motorboats etc can cause some damage to the bottom if your not careful.