theres a few things you could top rope in the fun rock area with some scrambling/easy free soloing to set up the anchor. Its all pretty much sport, not many crack routes.
At the end of the day, heading there to top rope is kind of a waste of time. theres not a ton thats actually anchor accessible and its not even that great of climbing, especially with the myriad of better options all around if you have a parter.
If your really dead set on soloing I would go through leavenworth instead of Mazama because you'll have more options there, or, I would just try to find a parter and do some climbing on goat wall or washington pass.