There is a campground on hwy 126 towards (or perhaps past?) Veneta... I've never stayed there... it is by Fern Ridge Lake? I have driven through and seen tent campers as well as RV campers.... I will look for the name...
There are lots of campsites along hwy 58 towards Oakridge. It's not a very far drive from Eugene - and it's a beautiful drive.
Also there is a KOA campsite with tent, RV, and cabins a bit north of Eugene... it's called the Albany/Corvallis KOA... you can find info at the KOA website.
Also check out reserveamerica.com ... they will show you State, Federal, and private campsites in the area.
Summer is busy... often you will not be able to reserve campsites ahead of time, but if you show up and find a campground host there will be a site available as people cancel their reservations last minute or leave to go home early.
The coast, too, is not a bad drive... it's only about an hour to the coast from Eugene via hwy 126. Also, Lake Waldo usually has campsite available and it's a beautiful and not to long a drive, either.
Check with BLM land - I have heard you may camp for free on BLM lands. (Bureau of Land Management)
Good luck!
