A multi-virtual with three waypoints leading you to a fourth, final spot. Can be done on foot (total distance, about 2.25 mi round trip), can be done pretty easily with a combo of foot and mass transit (gotta love Portland!), or certainly by car with some momentary stops here and there.
Start at the coordinates above (more or less -- the signal bounces around in this area!). Remember the name of the cache and figure out the number of points on the object in the left hand (hint: it's a prime number), and call that number A.
Then head to the following two waypoints:
N 45 31.A95, W 122 40.214 -- turn to the west. How may legs do you see? Subtract 2 from that and call the result B.
N 45 31.A99, W 122 40.459 -- How many characters are in the white rectangle (either side, not both)? Call that C.
Finally, end your Trek at:
N 45 31.7AC
W 122 40.6B1
...where looking up can get you some advice from long ago. Speaking of long ago, look around a bit and e-mail us with the date this place opened. It's noteworthy.
E-mail us the right date and all is well. No e-mail, though, and we'll likely have to delete your log. [8(]
Enjoy this virtual trip around the skies of Portland!