If you plan to stay in Ashford I have an idea but you cannot do it until late July. Rent a car or suv and start in Ashford. If you are coming from Seattle I would go early in the morning through Enumclaw to sr410 then pick up sr123 which will take you to the ohanapacosh entrance for Mt. Rainier national park. This will avoid the mind-boggling long line at the nisqually entrance and you can avoid 90% of the park traffic. From there take the liberty valley road towards Sunrise. When you get to sunrise turn left and head for the nisqually exit unless you want to get stuck with the crowds at paradise. This will get you to ashford but I would only stop at copper creek inn for huckleberry pancakes. From there head to morton down highway 7 and then pick up sr 12 to randle. When you get to randle get on sr 131 to forest service road 25. This is closed right up until summer and I've even seen it closed up to July if the snow is heavy. This takes you the back side of Mt. St. Helens and Mt. Adams and not many people know about it. From there follow it until you get to eagle cliff and fs90. You may want to detour a little further to Ape Cave (Google it). You can reverse back to ashford but I say screw that and make tracks to Carson. Stay in Carson it has a great hot spring and spa as well as a 5 star brewery and restaurant. Then from carson drive the gorge and stop at Bonneville and maybe bridle falls as you work back west. Then you can shoot over to portland/Vancouver and back up I-5. I grew up near Tanwax which is near Ashford and this drive never gets old.