Having lived in Bend, Oregon which is sometimes referred to as Central Oregon, there are never ending beautiful off the grid things to do. In Bend itself there are not many campsites. But head into the Cascades on the Cascades Lakes Highway and you will find the most popular camping in all of Oregon. There is a loop drive that goes past Mt. Bachelor, the sixth largest ski are in America, and then right into the Cascade Lakes region where there are too many lakes and rivers to mention. I can suggest a few but they are all interesting and have various campgrounds at them. To truly get off the grid, you would need to know the area well and have good maps. The previously suggested towns of La Pine, Prineville and Redmond are all losers in every aspect unless you like dead places for the most part IMHO. Sorry if I offend anyone. I am sure I did.
Bend itself is a great town with most everything you can want. In the summer there are a lot of outside music venues, festivals, etc. Very active place. But just one hour west, in the mountains, its all peace and quiet if you choose the right spot.
I would be happy to email back and forth with you about more details if you want. My email is email@example.com
Good luck and have fun dreaming.........