Greetings: Many years back my brother-in-law took me to Bagby HS.  I found it to be a great experience.  I'll be in Portland for a wedding and a spare day to return to the area.  I was going to bring my son and was hoping to tie a moutain bike outing along with a visit to the HS.  Any recommentations on good trails for MTB? I visited the district trails web page and looked like there were a few, but was looking for a little more beata if possilbe.   Thanks in advance!