-Thrill it up on December 11 when the Roller Coaster Race comes to Six Flags Discovery Kingdom! Register for the 5K run/walk or 10K race and weave your way around roller coasters on the scenic courses. Snag your medal at the finish line then join us for a post-race party with DJ, awards ceremony, and all-you-can-eat brunch option! $1000 prize purse for top 10K finishers. Free park ticket for Saturday evening and Sunday plus free parking, included with every registration. Discount for season pass holders and military.