Cabin rentals for spring?

I checked over the FAQ and there are great tips for moving to/entertaining yourself in Seattle. However, my birthday is in May and I would like to rent a cabin for a few days. I'm new to Seattle (only been here a few months) and haven't traveled much around the state yet. I want to camp, but I know some of my friends would like it to have a few more creature comforts so I'm willing to do a cabin. Can anyone recommend any places to go? I would prefer to be on the coast or an island, close to the water. I'm not entirely sure yet, but it would probably need to sleep about 6-10, or the option for people to use tents on the property. Any help would be fantastic! I looked over some of the state parks and those seem alright. Anyone ever rent a cabin from one of those?