Bremerton to Seabeck and Scenic Beach is a 37 mile loop trail located near Bremerton, WA. The trail is only recommended for very experienced adventurers and primarily used for road biking.
I enjoyed cycling this route and would consider this for leading a group ride. Many parts of this route did not have much of a shoulder. Favorite parts were going through Seabeck and Scenic Beach State Park. For Seattleites this is a nice route to ride from home to the Bremerton Ferry. See Biking Puget Sound for a great route description and all the info you need to cycle this route.
Didn't do the whole 37 miles... I believe its actually a lot longer then that. The 20 miles that I explored were very exciting with lots to see and plenty going on to keep you interested to keep going.