I'd like to suggest a couple ideas, and you can pick whichever you like most if any!

1. Jurassic Park: Your own rendition of a Jurassic Park sandbox, it could be a more exploration-based version of this story map https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=459315118&searchtext=Jurassic+Park
Maybe you could even include the River Adventure from Universal Studios too https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2930094979&searchtext=Jurassic+Park

2. Fazbears Frights: A rendition of Battingtons Fazbears Frights or "The Horror Attraction" with a functional horror-ride similar to Nippers Haunted Mansion. https://youtu.be/kjv4Vs2rw3M?si=4Jho5_TexAud8fA1, maybe some FNAF3 corridors connecting the staff areas

3. Sister Location: An eerie warehouse with a functional elevator leading to the underground Sister Location facility, this really hasn't been done and could be SUPER cool, it could have a guest elevator leading directly to all of the entertainment rooms and then the employee elevator would lead to all of the game offices & vents.

4. Universal Ride To Life: I had too many ideas for this so I'll just throw them out, basically a Universal Ride like Jaws, The Mummy or The Walking Dead but its made to feel like the actual film, so the Universal Jaws ride would take place on a harbor, The Walking Dead walk through would just be an abandoned building without any themepark exits, The Mummy would take place in an Egyptian pyramid, any of these really sound fun.