Clackamas Town Center to Canby Ferry

[Oldguyonabike]

I've recruited some new riders in my office near Clackamas Town Center who are interested in some after work rides this summer. The 205 path still goes south from here but I can't figure out an uncongested route to the Canby Ferry (where there's some interest here in exploring).
Do we have to take on 99? These guys are a bit green so I am trying to protect them from rush hour traffic and monster climbs.
Any ideas?