Great question BB1. Let's see... if I had to pick 1 area to change, it would be Action Zone. Those who know me know I love Action Zone, but I would love it even more if it reverted back to its original name: Adventure Village. The area now known as Action Zone became Adventure Village soon after the Wild Animal Monorail left and kept the name until 1999, where the area was renamed Paramount Action Zone (as we all know, the Paramount part of the name was dropped shortly after Cedar Fair acquired the park). Most of the rides would fit name and theming-wise (Congo Falls, Delirium, Banshee, The Bat, Xtreme Skyflyer) while Drop Tower might have to be renamed/rethemed* (though I wouldn't want the paint scheme to change). Invertigo would have to change too as it doesn't quite fit the theming, and in a perfect world, I'd remove it for an Intamin Impulse Coaster (going longwise under Congo and towards Timberwolf, the station would be near the start of Invertigo's line) because those things are awesome! Finally, I think I'd annex Adventure Express and Slingshot to the area just like back in the day (well, Slingshot didn't exist back then, but you know what I mean). Unfortunately, this would make Oktoberfest much smaller, but maybe Oktoberfest and AV could co-exist in some way. These are my thoughts, what say you?
*EDIT: Though, I could just rename Drop Tower back to Drop Zone if there were some way to get around the whole "movie licensing" thing since it wouldn't be related to the movie, but rather with the idea of freefalling from a perilous height.