I'm not sure what you mean by relatively flat. However, I've seen folks getting around on bicycles there in years past. Obviously, where most of the action is, is going to be flat, because it's a runway. The largest hill is going back to where the main RV parking and daily spectator parking is located. I've never been to the far end of the property where the second flight line will be this year, though. Small motorized scooters and golf carts are a common site as well. It would definately be well worth the trip if you can make it.