There are numerous considerations that would make a park like this a logistical challenge, to say the least, which is why it is so unusual (e.g., you could be riding indoor attractions/coasters in dripping bathing-suits!). But it was fun and different to imagine and draw such a place.
The park is about the same size as Anaheim's Disneyland (a little smaller than MK).
The Entry and First Land would be based on ruined Atlantis, not unlike the Mythos/Poseidon area of Islands of Adventure. The idea is Atlantis was a proto-civilization, so the architecture could be a hybrid of Mayan, Egyptian, Persian, etc., not just Classical). The lazy river (Castaway Creek) is this park’s encircling railroad and has entry points throughout. The river would pass through various environments (arctic to tropic), props, special effects and an ice cavern. Lost Continent would have the main changing rooms/lockers, retail, signature dining, and two major attractions: a Big Thunder scale coaster through the ruins of the Great Temple and an indoor E-ticket set-based dark ride (based on Atlantis seeding various civilizations on Earth before being destroyed). I opted for a smaller lagoon for the fountain show, because I think it's more effective when the visitors are closer to the water cannons (if everyone is in bathing suits, they might not mind getting wet).
The central park Icon/weenie is a larger version of King Triton's castle (TDS) built into the undulating coastal rockwork. The castle is a portal through the shell-like ridge/reef into the park’s hub-land, which has direct access to all other lands. The area is to feel like giant tidal pool (not under the surface as in Tokyo’s indoor section) where the various spinners are imbedded. There would be an all new Mermaid dark ride in this area – which is where the undersea parts would be presented – as well as a high-capacity dining venue.
The land is bifurcated into a polar/montane wilderness/scientific exploration area and a recreational ski mountain (nod to Blizzard Beach). The bigger, wilder mountain has the park’s vertical speed slides, the six-person raft slide (like Teamboat Spings) and serves as the show-building & base for the Yeti Rapids. The major dark ride in this zone is an LPS polar explorer attraction. The suspended ski lift coaster would be D-ticket family thrill.
This area is dedicated to studying and preserving the tropical coral seas. I imagined The Seas pavilion as closer in spirit to the EPCOT original and its contents as independent of the Pixar franchise (to avoid Nemo overkill). I imagined a Manatee Habitat (river) that flows out of the pavilion and through the land, so visitors can look down and see Manatees, not in a tank, but in a natural riverine environment. There is also the popular Crush coaster from Paris.
This area is also bifurcated into a Pirate Port, which would be ramshackle and dangerous, and a Crown Colony, which would be cleaner and more peaceful. I love exploration areas like the Tree of Life Paths (RIP), Maharajah Jungle Trek or Tom Sawyer Island and this area would have two great ones: the Fortress, which would be elevated on a rocky hill - a dark counterpoint to King Triton’s Castle. There would be layered vista from the lighthouse: the pirate ship (sit-down dining) in the foreground, then the pirate village (a conceptual elevation of which I posted last week) in the middle, and rising in the distance, the dark Fortress. There is a new 'Jewel of the Seven Seas' interactive game being prepared in MK's Adventureland. Buccaneer Bay would have a special area dedicated to such an experience (on the scale of Maharajah, with caverns, shipwrecks and ruins to explore and trigger special effects).
The Crown Colony would be more civilized port town with a Clocktower in the square. But the marquee ride would betray that feeling of safety, when the town comes under attack (in the queue) and visitors must flee aboard boats on a harrowing PotC-style adventure (new ride). The Typhoon Lagoon inspired wave pool is surrounded by a sandy, palm-dotted beach and backed by another rocky mountain that supports the various slides.