I believe you have big RV and Jeep toad. There's a lot you could do if you cross the Cascades on US12 (starting roughly at Yakima). This byways site gives some ideas, though it is only one of many sources
http://www.whitepassbyway.com/whitepassscenicbywaymap.phpFor example, take 12 over White Pass and setup camp at Ohana... in the Nat Park, or if that is full, LaWisWis Nat Forest. Then spend the next N days touring:
- to Paradise on the south flank of Mt R.
- to Sunrise on the NE flank
- WA410 east to US12, and back (or takes 'shortcut' over Bethel Ridge)
- drive south from Randal to the east side of Mt St Helens
- continue south through GPNat Forest to the Columbia, see the Gorge, loop back via other forest roads, or US97
http://www.fs.usda.gov/activity/giffordpinchot/recreation/natureviewing/?recid=31178&actid=64
