Get an unlimited pass to Six Flags parks for $49.99-$59.99, which includes lots of other freebies. Including:
-unlimited admission to all 13 Six Flags parks
-free tickets for friends on select days
-free admission to Fright Fest and Holiday in the Park events
-a $300 coupon book
-pass is good through 2011
Get a season pass for $49.99 (same price as a one-day admission) if you and three others buy tickets together. Otherwise, pay $59.99 for the pass. Get them here on Travelzoo through May 31. The Bay Area Six Flags Discovery Kingdom is in Vallejo.