Coyote, here's a route that's fairly direct & avoids most of the heavy traffic in downtown, using Waterfront Park path - a little over 3 miles:
http://www.bikely.com/maps/bike-path...-to-SW-Corbett
If you want to determine your own route, here's some good bike maps:
http://www.portlandonline.com/transp...=34809&a=70221