Just across from the Eau Claire airport’s runways, it’s a real treat when jets fly overhead, close enough that you can feel your chest rattle. A crisscross hill unofficially called the “X-Hill,” you can start at one of two steep, twin trajectories that cross each other at a wicked intersection before going off in any number of directions. This is never the same ride twice and the risk for some intense crashes is high. So if you are on the hill, consider yourself forewarned and therefore, fair game.