I've got plenty of ideas for the 50th anniversary!Here are my main ideas:
1-take out the go-karts and Dare Devil Dive and replace with an antique car ride.
2-flat rides galore! Namely a Larson Flying Scooters and Tilt-a-whirl, and a Huss 2nd Gen Condor,2nd Gen Enterprise, and Air Boat rides.
3-a musical/dancing fountain set-up for the lake.
4-shows all year for the Showcase theater, even if they have to "out-source" them.
5-get rid of the paintball building!
Honorable mentions: getting a brand new ferris wheel(or at least fixing the one they got) and gettting new trains for Green Lantern; by that I mean the new-style stand-up trains Sea World is getting or regular sit-down trains.
Also, IIRC HH turns 25 in 2024,so they get a Mack Power Splash and a Vekoma Family Splash Suspended Coaster.