Free: Contests & Raffles.
What level of toughness are we talking? You could always do the PCT from Snoqualmie to Stevens or Stevens to Stehiekien(sp). That way you will see alot of country.
Why not the Olympic National Park? The Enchanted Valley would be a good hike.
Have them go up Mt Adams. There are several threads on this site with pics of a Mt Adams adventure.
Another good one would be the Pasayten Wilderness. I'd go to the east side of it. Have them do some research on Cathedral Lakes and Horseshoe Basin. It probably wouldn't be as crowded as the Pacific Crest Trail.