I have seen a few of your maps, I have zero hope for this map.
None the less,
People enjoy stop the clock races (I use it on my last challenge map.)
People enjoy quests ( find the ..... In this area kinda thing)
People enjoy parkour, but not too much
Finally, people enjoy rewards. They will not find any fun in a map that has no rewards for completing challenges / mini games.
I remember seeing an automated leaderboard of the last 5 players to complete a level on one of the testers maps. I think it was Clerical, I'm not too sure though. Anyway, that would be a really cool thing to have outside each level.