For the first two weeks of 2011, our daughter's high school holds what they call "intensives" - elective courses that span the entire school day, dig deep into a particular subject, and generally involve field work. I've offered to help the teacher, Alison Zych, who's conducting a class called "Gear Heads" focused on Mountain Biking (and Spanish, too, FWIW).
They'll be traveling down to the Phoenix area Jan. 10-12 and will be doing easy rides at places like South Mountain, the Old Pueblo loop, White Tanks, Tempe Town Lake, etc. She could really use adult riders to lead/sweep some of the rides down there. PM me if you think that'd work for you...