I decided to follow a route proposed by John Meier from phred users group. Taking broadway over the river and moving up toward the airport and out marine drive. Decided to follow the Columbia river to Hood River. Coming back from the coast I'll probably take route 30 if I have enough time to get to Astoria.
If anyone has a better route on the way back, let me know. I'm looking for scenic. A route on from Vernonia to Scappoose was suggested.