For a seriously different activity in Washington State you could try "glamping" (ie., glamorous camping) at Alexandria Nicole vineyards near Prosser. Their website doesn't have all the info available right now as the reservations system is down for a reload...but some of the info and a picture gallery is available at http://www.ancglamping.com/.
I'm not attending the Rally for the whole time, plan on leaving Seabeck (Hood Canal area west of Seattle) on Thursday. Making a quick pass through Tacoma to get out of traffic, then the backroads via Randle past the east side of Mt St Helens to the Columbia Gorge near Hood River, OR. You're most welcome to tag along if you'd like to see some of our paved back country Forest Service roads...that is if you decide NOT to go glamping!
Cheers, Bill J
I am not sure if I am going to rally from Auburn/enumclaw area but if I have time and weather is good I was going to go south thru windy ridge side of mount st helens and like you along river to hood river. Maybe if circumstances work we could hook up. Iwould be riding a GS and camping all the way if that matters.