Hello microgear,
Unfortunately I will be Rejecting your map.
The theme is original, there are a few maps that feature water as it's theme, but none exactly like this. The build looks a bit messy, I would suggest trying to add a bit more shape and definition to the build, as well as using multiple blocks, rather than just lapis.
The parkour isn't bad. It does feel repetitive at times since some sections were just normal blocks, but there is some variety.
It did get quite confusing at parts, I would suggest trying to create a clearer path for your parkour, since it can get confusing having jumps change direction so often.
The length is a bit long for an easy map. Some of the jumps suit an easy, and some suit a medium.
Thanks for submitting your map! I hope to see more maps from you in the future.