Cama Beach State Park
1880 SW Camano Drive
Camano Island, WA 98282
There are no cabins available at the park, but you can find plenty of rentals in the area. Here is a collection of searches for rentals that are available that weekend. Reserve early as we are not the only wedding on Camano Island that weekend.
Cama Beach State Park is about an hour north of Seattle. There is a fairly large parking lot, but keep in mind that this is a state park and requires a Discover pass. Day passes can be purchased in advance here: https://store.discoverpass.wa.gov/shop/daypass.
Directions from Seattle: