Best to hit in Oregon... Milo McIver (Estacada) is a beautiful championship level course, Dexter (Eugene) is a well designed technical course in a beautiful setting, and Whistler's Bend (Roseburg) a fun course in a beautiful park with stunning views. In July it would be hot enough in Roseburg to float the river that surrounds the park on 3 sides... put in at the day use area and get out at teh camp ground... VERY frun.
As long as you're there Pier Park (Portland) is a beautiful Portland park, Timber (Estacada) is a fun course, Adair and Willamette (Corvallis), Tom Pearce Park (Grants Pass) while it has funky baskets, it's along the river and has some interesting holes.
I wouldn't waste my time at Rooster Rock... sorry! I just think it's a bit of a drive for a disappointing course. Champooeg is a cute little course, but dosn't present a huge challenge... still fun to play.