Originally Posted by
knobster
I've ridden it once and would suggest taking a bike that can do well off road as well. Quite a few sections are unpaved and one part requires some mountain climbing abilities. I used a cross bike with 700x32's and it worked well. Have lunch in Vernonia.
There apparently is a nice trail in Forest Park, but haven't ridden that yet.
The OP's bike (Trek su100) seems well enough for the job.