I would like to see Toon Lagoon totally revamped (everything except Sweet Haven could either demoed or revamped)
Hanna Barbera is the most obvious way to keep the classic aesthetic while remaining relevant.
The sections could be Scooby-Doo, Flintstones, Jetsons, and Popeye (close enough since it's been on Boomerang for years).
Four mini-lands that make far better use of Toon Lagoon's space than the current offerings. Plus, the amount of soaking wet Es would be reduced to two. And a family dark ride/coaster would be a given.
Nick/DreamWorks make more sense for a 3rd gate. Zelda, Pokemon, Metroid, Star Fox and Kirby, too.
JW, Monsters, Warcraft, Godzilla, original concepts, etc.. can balance out the kiddy nature.