The Portland Metro Area's greatest attraction is Oregon's largest city, Portland. However, there are a few sites in the suburbs too.
Check out the malls and eat some good sushi in Beaverton.
The countryside and great golfing is only ten minutes outside the city in Hillsboro.
Lake Oswego, when not a hellish piece of suburban sprawl, has a vibrant downtown area.
Ride the train all the way east to Gresham.
Clackamas really isn't much to write home about.
You can freeload off of Portland's good graces up in Vancouver.