You may want to check out the Succor Creek area. Yes, it's a long way (even from Bend), plus about an hour on a grave road. But it has miles of Jeep, motorcycle, quad riding, rockhounding, and great hiking in the Owyhee Canyonlands. It's an Oregon State Park, but there is no charge and the best camping isn't in the campground anyway, but along the road (and creek) on the way into the campground. Super, unlimited, camping opportunities with great views on the BLM land adjoining the park as well. Darn, now everyone on this site will be going there.........don't forget the hour drive on a gravel road......
p.s.;
Only go in the spring or fall. Summer would be pretty warm and winters are cool/cold. If you go in the spring, watch the weather as too much rain (or melting snow) makes the gravel road a bit muddy. Fall has hunters (where doesn't in Oregon???)
Google "Rockhounding Succor Creek" (or similar) to see what you might find there. I believe a couple rockhounding clubs regularly go there. Just know that the picking won't be as "easy" as at Richardson Ranch. Personally, I wouldn't go there just for the rockhounding, but rather the hiking (Jeeping in your case) and camping.
