Knowing that the server has a kinda small little parkour area built into the new spawn why not make a world or some are to do parkour and things possibly between the islands of the new "hub".
World:
If added a new world then you are probably wondering "Why a new world?" Well Seeing that it may possible to run a Re Generated End to reset daily i would personally like to have the parkour regenerated daily.
http://www.youtube.com/watch?v=s2ldUWbSbFU
It may be possible with a Plugin to help it out to auto Regen?
Added to Hub:
If it were added to the hub it would probably take a lot longer to build and possibly take away from the scenery.