description of the ride, from the UAL's PR:  CELEBRATE NORTHWESTERN WINTER!
  
  Sure, winter solstice in Portland can be 'cold' and 'depressing', but believe me kiddo,
  other parts of the country have it much, much worse.  And to prove it: a bicycle ride
  passing by the multitude of palm trees growing in the city! We'll also check out some
  other evergreen plants and trees, plus you'll get all the fun factoids that the Urban
  Adventure League is becoming known for.
  
  Let's face it, if winters here are really that bad, there's NO WAY in hell tropical
  plants could grow here!