West from Las Cruces, still on Interstate 10, is Los Angeles in twelve or so hours. Make sure to turn right before you get your car wet. Interstate 5 would probably be the quickest way to get out of that city. After six or seven hours northbound, you might want to take a detour west to San Francisco. You could get on scenic U.S. Route 101 there (you could also get on 101 down in L.A., but that wouldn't be the fastest way out of Southern California). In another eight hours (if you stay on I-5), you pass through Portland and into the wonderful state of Washington. You might want to switch drivers here, too, especially if one person has been driving for the last twenty-two hours since El Paso. After a little while, look on the right for Mt. St. Helens (Boom!) It might be too short to see now, though--I don't remember. When you pass Chehalis/Centralia, you might be able to see the Mountain off to your right. Better views are sure to come.
About two hours or so since Portland, fly through Tacoma and exit eastward on Highway 18 in Federal Way. You can exit after about twenty minutes onto Auburn-Black Diamond Road--a fun road to drive. Make sure to take a right, and then a left onto Thomas Road after another twenty minutes and then a right onto Covington-Sawyer Road. If you prefer the more straight, boring, quick road approach, keep going on 18 until you get to the Kent-Kangley Road exit. Take a right and then an immediate right again onto Covington Way. This road turns into Covington-Sawyer Road shortly (you won't even notice). From either path, tak. . . under the power lines. . . back.