Sleep here and hike Salmon Creek
Green Canyon is a very easily accessible campground from Portland which can make it hard to get a site on the weekend! It's a great base for doing the Salmon Creek hike or just chilling out by the riverside. Some of the sites are right on the river so you can go to bed listening to the river run.
The campground location right off of HWY 26 on the way up to Mt Hood near Welches makes it convenient to get away for a quick trip, yet really feel like you've escaped the city. There's a subway right at the turn off in case you have a food emergency, and a grocery market not too far away. You're also not too far from Sandy if you need to pick anything up on your way in.
Sites are wooded and have standard fire rings and picnic tables and are decently sized.