A nice ride is down US-97 to Wasco, then OR-206 SE to Condon and on to Ruggs and Hepner, where you can pick up 74 NNW to Morgan and intersecting I-84 about 45-50 miles upriver of Biggs Junction.
One of my favorites is north to Goldendale, then west on 142 and eventually down a steep 1-lane paved road into the Klickitat river canyon, ending up at the western edge of Lyle, WA on WA-14. Just a few miles downriver from there is a scenic overlook on the left. Then an easy ride (this part of WA-14 is fairly well patrolled) back to Maryhill State Park, possibly with a stop at the Maryhill Museum which is a worthwhile stop.
If we get a chance to ride Maryhills Loop Road which begins just up the hill from The Gather near the Stonehenge Replica, and you like tilting the horizon and scraping your pegs, do it! Highly recommended. Traffic will be one-way and there will be no LEOs to worry about.