Looking at San Juan Excursions out of Friday Harbor (says 3-4 hours) or Island Adventures out of Anacortes (says 5-6 hours). With the former we'd obviously take the ferry from Anacortes (leave our car in Anacortes). Leaning towards SJE since we'd be on a relatively small boat less time (ferry being quite large), plus we'd get to see Friday Harbor. Any advantage to taking the trip directly from Anacortes, other than not having to deal with the ferry schedule? This would be a day trip out of a Seattle on a Friday in July (the 12th).