Generally speaking this one is showing a lot of potential. The layout is good, and the cliff side racing in particular should make for some interesting moments. I do have a few notes, however.
A couple trees are planted a little too deep. There isn't many so just cruise around and adjust as you see fit.
Checkpoint three disrupts the flow of the track. If you want to leave it as a launch ramp for a jump, that would be fine. But as it is now it doesn't bring much on it's own.
I think that probably the whole thing could use some smoothing. It's not bad, mind you, but it could be a much faster track than it is.
Lastly, here's a pic.
What I want to emphasize here is that the pointed take off and landing spots, as well as the upper edge of the hills, are rather contrived in appearance. The swooping downward arch is smooth in comparison. I know it's not always easy, and sometimes not even possible, to create something that flows perfectly smooth or natural but I think there's room for a bit of improvement here, and in a couple other spots.
I'll leave any short cuts to the racers.
Overall, tho, good start. This will definitely turn into a great track.