Oh I am lovin this. Ok, here we go.

The bumper car thing is a great idea because Grunge is the most important thing musically to happen in the 90's......next to:

Radiohead. This band changed the way we listen to music in the 90's. No one else accomplished what they did and they will live in Rock history for doing so. Just for your own knowledge, this is the most important band of your generation. You need reasons you say? Great. Radiohead did experimental things with sound and electronic music that other bands were afraid to touch. Their lyrics are VERY good, touching the ethereal with the great vocals of Thom Yorke.

Now to everything else.

Nine Inch Nails. This band did wonderful things with sound and electronic methods. But not as much as Radiohead, hence why they are more important. Trent Reznor could've brought this band to glory and beyond, but drugs got in the way of course.

MC Hammer. I thought of parachute pants. Make a great amusement ride, I think.

Red Hot Chili Peppers. I don't what you can do for a ride, but they are the most consistent band to come out of the decade. They are still making great music to this day and no other band from the era can claim that. Except Radiohead, but we already established why that is.

Marilyn Manson. I guess if you wanted a face painting booth or something. Other than that, there's really nothing you can do here.

Barenaked Ladies. These guys were HUGE in the 90's. As for a ride, nothing less of a burlesque show will do.

That's all I can think of as of right now. If you need more, lemme know and I'll actually be able to think of more.

Nirvana.
Beastie Boys.
Beck.

Pretty influential artists.

And definately radiohead.

new kids on the block kind of started the whole boy band craze back in the 90s... not that i like they're music... idk if you want different bands or different genres.... you can think about bands that have been around since the 90's and are still around... like chili peppers & radiohead like mentioned earlier... bush, pearl jam,
the offspring, which didn't start but popularized punk in the 90's... then you could think about people like meatloaf, celine deon, whitney houston, mariah carey -- ya know, genres other than rock variations

Greenday. Something like what Epcot Center was supposed to be, but about going green and becoming sustainable....Which, oddly, if it were to actually be done, Greenday would probably love to actually write a song for!

Nirvana.
Beastie Boys.
Avenge sevenfold.