If running a 5K, 10K or 15K is the last thing on your mind, how about riding a 5K, 10K or 15K? If you are a thrill-seeker who likes to live on the edge and loves the bone chilling, spine tingling, exhilaration of roller coasters, then this event is for you! Join us at Six Flags Discovery Kingdom, for our first ever Coaster Challenge! Choose a 5K, 10K or 15K, raise the minimum for the level you select, and that is the distance you get to ride on the exciting Coasters at Six Flags Discovery Kingdom. Gather a group of your friends and put a team together or go solo as an individual rider and after you're done with your Coaster Challenge, enjoy the rest of the rides and attractions at Six Flags Discovery Kingdom on us with free parking too!