They are good rocks! I rammed my hand into one I wasn't expecting, while heading for the beach, so I can definitely confirm both their weediness and their solid rockiness.

I'm thinking about getting a cheap sleeveless wetsuit to keep swimming into October. (It's never the sea temperature that's the real barrier here, but the air temperature getting back out.) I don't trust the plague to end, and at least the sea is in the open air.