Spencer Spit State Park is located on friendly Lopez Island just a short drive from the ferry terminal. It has many sites and is popular with locals and tourists. Most of the sites are for those arriving by car, but there are a few for cyclists, hikers, and human-powered watercraft. There is a large carpark at the entrance and you have to carry your gear in, however they provide wheelbarrows to assist you. The human-powered watercraft sites are a bit hidden. They are located on the south side of the park up the hill from the kayak rental hut. Which you can rent kayaks from if you want.
Jones Island Marine State Park is an island located just west of the southwest tip of Orcas Island in the beautiful San Juan Islands. It is only accessible by private watercraft but is easily reached via kayak from Deer Harbor. There are two campites, one on the north cove and one on the south cove. Winds can make for an unpleasant visit if you end up on the wrong side so check the weather before you pick a side. There are plenty of trails around the island to explore and beautiful views of the other islands and the sunset. Raccoons can be a problem if you are unprepared and leave food out or in a non-raccoon proof container so be sure to secure your food.
Sites are nice and spacious. Campsite hosts were extremely friendly. Water is available at spigots around campground but has a bad metallic taste to it. Mosquitoes will eat you alive.