Saw this post a long while ago and wanted to respond, but only when I had time to really dig deep for this answer, because there is a lot!
Zelda has a ton of potential for a themed land in many facets. Architecture and landscapes, characters and fictional races, iconic food and items, music that rivals Super Mario and Pokemon. Here are some of my thoughts!! Hopefully these can get people who aren't familiar with Zelda caught up on what us fans are so excited about.
These mechanical beasts were made by an ancient Hyrule to defeat the main antagonist Ganon over 10,000 years before the events of BOTW. The people of new Hyrule discovered them and planned on using them to defeat a resurrected Ganon the next time he arose (this happens very often in Zelda canon for larger lore reasons haha!), but when Ganon returned he was powerful enough to corrupt each and every Guardian in the kingdom with his evil Malice magic, turning them against Hyrule. The Guardian Stalkers, pictured above, are a kind of Guardian that still prowl around the kingdom when Link awakens from cryostasis 100 years later, using their spider-like legs to quickly ambush the hero before shooting him with an incredibly powerful laser beam located in their eye. Very formidable foe with an iconic design, and one of the main additions to the Zelda canon.
Some Guardians have survived the 100 years relatively intact, but some are not so lucky. Some have completely lost power and broken down in that time, while some are still powered on only having lost use of their legs, rendering them immobile. These Decayed Guardians are still fully able to use their eye lasers and can kill the legendary hero in only 1-2 shots. If I'm not mistaken, these guys appeared in the Blue Sky concept art Universal made a few years back.
Their static and robotic nature makes these guys perfect for some kind of large scale animatronic effect. Even just a Decayed Guardian with a swivel-base and some awesome lighting and faux moss/stone work would make for an amazing and imposing threat on a ride or in a land.
The Great Deku Tree is not only a place, but a character! Zelda stories often repeat similar plot, character, location beats from each other due to a curse on the Kingdom of Hyrule to eternally repeat itself across countless millenia. So there have been multiple Great Deku Trees! Whenever he does appear he is an incredbly old and wise spirit that helps Link through his journey and has been connected to both the legendary Master Sword that Link wields and the Kokiri/Korok spirits that act as little playful tricksters hiding in the world. He also resembles a certain classic Lost Continent icon quite a bit.
Kakariko Village is a recurring Zelda location from the Super Nintendo all the way up to the Switch. It is very consistently connected to the Shiekah tribe, a community of Hylians molded off of Japanese culture and connected to the Hyrulian Royal Family. In the newest games, it has a distinctly Japanese aesthetic unlike anything currently offered at a Universal park. It also serves to connect different elements of Zelda due to its proximity to certain landmarks in specific games, like Death Mountain, Hyrule Castle Town, or smaller elements like Cuccos (Zelda Universe's Chickens) or the Shiekah tribe themselves.
A huge imposing figure in the skyline of many Zelda games, Death Mountain is a recurring tall volcano with a surrounding region usually settled by a race of peaceful ogre-like people called the Gorons. It is a challenging level due to all the fire and lava and usually houses a dungeon and a very powerful boss inside the mountain itself. Could serve as a fun New Fantasyland Beast's Castle-esque addition to the skyline of the land as well as a more dangerous feeling section of a ride.
I could go on. I haven't touched on Hyrule Castle, Lon Lon Ranch, the Great Fairy Fountains, the many dungeons filled with enemies and puzzles that Link has to face, or the Temple of Time which was included in the Blue Sky artwork leaked from Universal. There are also smaller elements like the endless iconic music tracks that could play throughout the land. Food and drink like Lon Lon Milk, Elixirs, Potions. The many recurring enemies and bosses that could make for awesome setpieces in rides. Or how the use of puzzles and traps in a dungeon setting followed by a climactic showdown between Zelda, Link VS. Ganondorf could be an amazing stunt show to fit within the Sinbad stage.
Hope this serves as a little taste of what we are so pumped about the possibility of!