I bribed my niece into making a bike run to McDonalds by saying I'd buy her a yogurt parfait if she rode. If you have a niece in the area you might try the same trip/trick!
The temperature was in the high 90's as my niece decided she couldn't resist the offer of her favorite uncle ;-) treating her to a frozen treat at McDonalds. A nice ride that misses most of the high traffic areas yet gets you from Wilsonville to Tualatin without much fuss. 14 miles total trip.