We spent a week cruising the San Juans in our Capri 22 in July 2010. We had a great time and were pretty much the smallest boat at Spencer Spit and Echo Bay on Sucia. It didn't mean we had any less fun than the others though.
Never actually anchored, we used the state moorings, but I had along 2 claw anchors in case I needed them. 5 kg rated for my boat and a 7.5 kg rated for a larger boat.
The current in Rosario Strait on the way back to Anacortes was running fairly strong so we pretty much motorsailed across at a 30 degree angle. No real problems to speak of for most of the trip. Snagged some kelp on the way out of Friday Harbor, which was briefly exciting (stopped us dead in our tracks), and we got severely waked by a big stinkpot in Guemes Channel on the way back to Anacortes. That would have been lot less annoying if I'd remembered to dog the bow hatch before we left Friday Harbor that morning. I think we took about 5 gallons of water aboard; I was pissed, at myself and the ***hole in the stinkpot.
I'm putting together a group cruise at the end of July. So far it looks like we've got 2 Capri 22's, a Catalina 22 and maybe a Mac 25 interested.