I have some tips for you creating a map!
1) Come up with a unique theme that no one has created on the server
2) Make a main build that fits your theme
3) Make sure that your parkour is built against your main build and use blocks that blend in so as to not take away from the map
4) Use a wide range of different blocks in your parkour as to vary it up. This may include things like fences, heads, glass panes, brewing stands, water and so on
Good luck with your next map!
- Bin