I have an upcoming camping trip in the San Juan islands with a group of friends from Seattle...I want to bike through and back Deception Pass and Whidbey Island! Does anyone have any good routes or route planning techniques for this? My main fear is that I'll follow Google maps and end up on a two lane road with no shoulder...
How set are you on riding the length of Whidbey? I found the riding on the south part of the island nice, but hilly. The main route (525) is not as hilly (I think) as the alternates and generally has a decent shoulder, but is fairly busy. The big thing, however, is figure out the route from Seattle to the Mukilteo Ferry Terminal. You can use the Interurban Trail for some of it, but it's pretty disjointed north of Seattle, and seems to involve a lot of riding around freeways and humongous parking lots around malls.
If you want to avoid some of that, you can ferry across the sound from Seattle. You can ferry to Bremerton and pick up the Pacific Coast route that Carla mentions. When I rode up this way a couple years ago, I opted to ferry to Bainbridge instead and ride to Port Townsend. A lot of it is on pleasant and quiet (and rolling) country roads. But do to the geography of the area, there are a few "pinch points" like the shoulderless Agate Pass Bridge. (Hood Canal Bridge now has a decent shoulder.) And there are a few stretches of busy road, like 104. But overall I liked the ride. Here is the route:
https://ridewithgps.com/trips/3254650There are a few campgrounds around Port Townsend (like Fort Worden, with a hiker/biker site) so it makes a convenient end of day.
From there, you can take the ferry to Keystone and then ride up to Anacortes. There are a few pinch points as well, like Deception Pass Bridge. But overall pretty nice (and hilly!)
https://ridewithgps.com/trips/3255996As for your concern about "two lane roads with no shoulder", well, most of the roads you'd be using that are not state highways are going to be like that. But these roads tend to be on the quiet side. You usually only find shoulders on busier roads. For me, I prefer touring on quiet shoulderless roads than busier roads with shoulders, but everyone's different.