I'd follow Drone's advice. But hit Spokane on your way to the Gorge. By that time you'll be sick of the hack. I'll gladly let you store it permanently in my garage.
In reality, I'm very happy to hear that you bought this wonderful rig. Get a copy of the Yellow Book before you try riding a hack, if you can. read it and then take your time learning how to ride the new bike. Wish you had the opportunity to take Vernon Wade's "Adventure Sidecar" class down in Hood River. I took it last fall and have never looked back. Sorry to tell you that now you'll be an addict just like the rest of us. Ride safe and have fun!
"Seika" - 2013 DL650 + DMC M72D Sidecar
"Gracie" - 1983 R100RT 60th Anniversary Edition
"Dusty" 2011 Adventurized 4Runner
"Adventure is worthwhile." ~ Aristotle Airhead #14449