Hi Icewoman,
Highland turns into a circus on weekends. 4-wheelers, sleds, cars, trucks, motorcycles, and yes, even airplanes if conditions are right. I don't mind the airplanes they are cool to see around.
What seems to happen there is that all the activity on the lake kills the fishing action, some days the lake just shakes with noise. The local snowmobile trails are getting cut back due to development and there aren't many 4-wheeler trails so it turns into the high-speed racetrack that is nearest to Portland.
Very convenient to a lot of guys with power toys. You just have to live with it if your fishing there.