I know this would take a lot of time but it would be geat for the server. It should cost $1000 to enter and you have 3 lives. Every new month or two there should be a new adventure map. There should at least be jumping puzzle,puzzel.crime.adventure, survival and others. Also, these maps would be 1/4 the size of the big regular maps.
Do you mean the adventure game mode that is ment to be added to minecraft soon? And I think 1/4 the size of the main world would be too big. It would be more likely that it is 2000 by 2000 blocks if it did happen.