I'm struggling to see how it would be very interesting compared with, say, a rollercoaster or a drop tower, where there are external frames of reference, and full 1G (or more) acceleration / weightlessness.

I imagine the experience would be about as interesting as taking an elevator down a tall building. Maybe I am missing something, though?

Pretty sure it can be done with aluminum pretty well, so it probably wouldn't be that expensive compared to some rides.

You couldn't use multiple magnets on the person or they might smash together, and you'd have to be very careful guests stayed apart, and that they didn't have anything magnetic in their pockets to go flying towards the magnet and hurt them.

You could do it with air pressure, like indoor skydiving in a confined area, but it would probably be loud and somewhat unpleasant.

Since people aren't magnetic it would probably feel exactly the same as jumping with a harness on a cable instead of with magnets.

Unless you used the frog levitation thing but that's a different effect and would probably be really expensive