Agree with comments about converting Springfield into Bikini Bottom. It would be an instant classic. They're still churning out episodes of the show and making movies so it's still very relevant and family friendly. It's honestly shocked me that the only Spongebob related thing at Universal is the store.
Fast Food Boulevard could
easily change into a
Bikini Bottom Boulevard/The Krusty Krab Food Hall easily. You could even write it into the lore that Mr. Krabs decided to expand The Krusty Krab into a food hall with more dining options for $$$.
- Lisa’s Teahouse of Horror ------> Pearl's Place
- Luigi’s Pizza ------> Krusty Krab Pizza
- The Frying Dutchman ------> The Chum Bucket
- Cletus’ Chicken Shack -----> Sea Chicken Shack (or Sandy's Spot, could even be BBQ influenced given her Texas roots.)
- Krusty Burger-----> The Krusty Krab (Obviously)
- Flaming Moe’s-----> This one's a bit trickier to re-theme but I'm sure Universal figure it out.
Duff Brewery would also be a little bit trickier but would actually be really fun to re-theme into a
Bikini Bottom Tiki Bar honestly. Maybe Patchy the Pirate influenced?
I think that
Kang & Kodos’ Twirl ‘n’ Hurl could be given a
Plankton retheme very easily or the
Flying Dutchman.
As far as
The Simpsons Ride, it wouldn't be hard to change into
The Spongebob Ride. Just change the cars into a boat, swap out the video, and you have
Spongebob's Boating School Blast or something similar. Really the options are limitless.
Then just convert the rest of
Springfield into
Bikini Bottom. Keep Midway Games just change them into a nautical theme. Spongebob Character Meet and Greets could expand into this area beyond the Spongebob Storepants. Shut down the current Spongebob Storepants location and move it into the Kwik-E-Mart area. It's a no-brainer really.