Don't drive on the 'ring unless you are actually insured.
Maybe think about hiring a Suzuki Swift at the 'ring if you want to drive the calendar, unless you're confident that you actually have insurance.
Have you checked the touristfahren calendar for dates?
I'd recommend stay at anywhere but the Dorint, to be honest - experience much more of the locale. Somewhere like Burgstube or Sliders Guesthouse (both run by Brits) rather than corporatehotelanywhere. Yes, I have stayed at the Dorint and both of the above, too.

Pinocchios in Adenau for pizza.
Pistenklaus in Nurburg for steak on a rock and sh*t service.
Comfy Corner in Adenau for food and beer. Make sure you ask Karl (the owner) what the weather will be the next day. He'll love that.