The Cascade Marine Trail Campsite in Washington is a first-come-first-serve camping area for human-powered boats. It offers breathtaking views of the surrounding water and mountains. Visitors can enjoy kayaking, whale watching, and beachcombing. The campground has basic amenities such as fire rings, picnic tables, and composting toilets. There are 10 campsites available, and the best time to visit is from May to September when temperatures average around 60-70°F.