The first ? Panel in Acorn Heights can be found from the track's start line. Fast travel there and then go around the first turn that goes inside the tree. At the end, veer left to go off the standard ...

From the start line, do a quick U-Turn and drive left over a few silver ramps. As you come over the second one, you’ll see a ? Panel on a ramp to your left. After grabbing the last ? Panel, follow the ...