Six Flags 5K Coaster Challenge for Special Olympics

I am always looking for ways to help charity, and my friend Eric just brought this to my attention a couple of days ago. It is like your typical 5K, except that instead of doing 3.1 miles of running, I have to ride 3.1 miles of rollercoaster (it worked out perfect for Eric, cause he is injured and not allowed to run right now anyhow). I only get to participate if I raise the minimum though, and it all goes towards the Special Olympics.
The event is this Sunday, so I do not have much time to raise the money, but every little bit counts.