Heya bca_,
Here are some thoughts about your map while testing it:
While testing your map, I noticed that the theme wasn't gonna be original due to the amount of biomes/desert themes we have, but after a little talk on DM's I checked Delicate Arch and it doesn't seem like there are any at the moment, so I'd say you should be fine, anyways consider, as Tasses mentioned above, there is a Grand Canyon map.
About your build, it's well-built, and similar to the theme given. Anyways, there weren't a lot of details in your building making it look plain and a bit boring. (I know this is how the theme goes but maybe adding some structure surrounding the area would have made it a little bit better).
About the parkour, it's varied and fits the difficulty you have chosen. Also, I have to agree with Quinny about that checkpoint, that would really reduce confusion when doing the map, and also adding signs on where to go will be super helpful too.
Good luck with your map submission and hope to see more maps from you in the future!