Mini Golf Courses
airsoft indoor shooting range
Minature Motorized Vehicles
minature speed boats like the ones that used to be at wonder world. they had remote shutdown incase racers wen outside the bouy markers or were hitting other boaters.
go carts – electric / gas
underpowered seadoo racing
bulldozer – loony game
roulette wheel – some of the easiest odds to play 50/50
use old satellite dish to make one of these, could use 3d printer for center peice or just use a tube rather than secondary cone.
https://www.youtube.com/watch?v=MTY1Kje0yLg&t=167s use 2 layers of cloth to make hyperbolic version then cement it