How about WV? Canaan Valley resort would be plenty big enough to handle the rally. It is close to Seneca Rocks, Spruce Knob( highest point in WV), Greenbanks Observatory,Cass scenic Railroad, Smoke Hole Caverns, Black Water Falls and Seneca caverns. The resort has bungalow cabins large enough for three or four couples if you want and camping on site. Almost forgot. All the twisty's you can handle for a week.