Volunteer Park Conservatory at 1400 E Galer St on Capitol Hill is a Victorian-era glass conservatory with year-round tropical plantings — one of Seattle's most beautiful and intimate ceremony settings, permit required through Seattle Parks. Ruins and Rooftop at The Edgewater Hotel at 2411 Alaskan Way on Pier 67 places you on the waterfront with Elliott Bay views and the Olympic Mountains in the west — boat-accessible, intimate, waterfront Seattle.
Sodo Park at 3518 S Normandy St in the SODO industrial district is a warehouse-loft venue with exposed brick and high ceilings in Seattle's most authentic working-industrial neighborhood. Larsen House at 5623 46th Ave SW in the West Seattle neighborhood is a craftsman residential venue suited to micro-ceremonies in a wooded setting above Puget Sound.
For outdoor settings, Discovery Park at Magnolia (permit required for ceremonies; the West Point Lighthouse at the park's tip sits on the water with the Sound and Olympics visible), Olympic Sculpture Park along the waterfront (Seattle Art Museum permit), and the Hoh Rain Forest on the Olympic Peninsula (about 3.5 hours, but accessible for a dedicated elopement journey) all provide distinctly Pacific Northwest outdoor environments.