Current regular Knotts season pass is $59.99 or a Gold pass which also allows entry to any Knotts Soak City waterpark. Both are good until the end of 2011 rather than a year from purchase.
There is plenty to do at Knotts especially if you enjoy coasters. Lines are much shorter than at Disneyland but still can get lengthy during peak holidays etc. Biggest crowds are when Knotts has their holloween nights. Those nights are not for young kids like Disneyland's. They are for teens and above and can get VERY crowded.