I say Ultimate Super Mario Death Race. It could keep score like Buzz Lightyear, and be the second Internet Connected Attraction. From the internet they could make those huge pylons pop up out of the ground, and you'd have to avoid them.
Or: "Jackass: The Ride." Go Karts, no track, around 45 mph, and make 'em sign a waiver. Woo hoo! And incorporate some elements of Test Track, and incorporate the rocket launch from the latest Jackass movie.
I think either of those represents the world of Tomorrow pretty well.