Re: Oregon suggestions - 4wheeling, camping & mountain bikin
Keep in mind that if you're over 3,500 feet or so, you're going to begin to hit snow even in May. I tried to ride Newberry Rim a couple of years ago in June and got turned back by drifts even on the south facing slopes. Depending on the weather in April and May, it's possible to have remnant snow down to 1,500 to 2,000'.
McKenzie River Trail and the lower elevation trails around Bend should be in good shape. Hood River has many options from essentially sea level to 6,000', so you are guaranteed to find something rideable. Central and Eastern Oregon camping and 4WD should be okay as long as you are out of the Cascades, but be prepared for cooler nights.
You will find some great stuff, just be prepared with several options and let the conditions on the ground dictate where you go.
2002 E350 EB - Voyager top - 7.3 - Quigley 4WD