I have made a parkour course of Hard difficulty (In my opinion) on the Minevast Creative Server. It is called LadderCeption (It has a ladder theme) and has 72 jumps. The username of the creator (me) is happyheart. To get there, you can use /warp HolyWalls. However, this will take you to a different map, so you'll have to go to the other corner of the plot where this map, LadderCeption, is located. Crush set the warp. I have used no WorldEdit for this map.
Here are some screenshots:
Here are some screenshots: