FO row peterpuffer.
There are some amazing sections for tubing on the Oregon Deschutes, but that's just too much water.
The Yakima has a great float that I made many years ago. Perfect amount of flow, perfect water, fun, long riffles, but too many people.
The lower Sandy ending at the I84 park in Teoutdale is a good one, but again too many people.
The upper John Day, in early June most years, is just about perfect. It's warm, clear, full of fiah if you're inclined, and moves along perfectly foe inner tubes or floaties.
Once per summer my friends and I get together here in the back yard, pack small inner tubes up the Wind to the falls, and float back down. This is pretty rough water and not for people adverse to eating shit and body surfing through some class 2-3 chutes. Fun stuff, but not for everyone.