This is one of the northern most islands in the San Juan's so don't be surprised if the US Coast Guard is lingering about. This was one of my stops on a two week sea kayak adventure in the fall.
Like all of the marine state parks in Washington, this site is well maintained. You will find clearings for pitching your shelter, a picnic table and relatively clean vault/pit toilets. There is also great signage so you are certain of where you are.
These sites are remote, so don't expect many visitors and be sure to soak up the incredible views (especially around sunrise and sunset).