There’s lots of room for gathering on the water either in the Portland area (confluence of Columbia and Willamette Rivers) or in Puget Sound. Lots of boats for rent and purchase as well.
Puget Sound has some serious benefits for the small budget seasteader because with the IMMENSE amount of shoreline there is plenty of affordable housing not far from saltwater (not necessarily on the beach, but it doesn’t really need to be) and lots of access. There’s also a pretty robust ship building industry, fishing industry, construction resources, lots of private boaters driving a busy market for marine supply. Lots of self-reliant types as well, outside the bigger cities.
It’s a lot better incubation environment than San Francisco Bay IMO. Nobody can afford to live in SF while investing in projects, for one thing. The area is massively larger, for another. It’s better protected for early stages.
Travel to Sea-Tac (as an international hub airport) is easy and affordable for meet-ups as well.
It’s not as warm as the gulf, the Carribean, or exotic tropical destinations. But it doesn’t take a passport or visa to get here (for Americans). You’re protected by US contract law and practices.