Kings Island is open weekends only now (mid-April) now and will open weekdays May 23, the Wednesday before Memorial Day.
The single day ticket price is $44.95 (for people 3-61 years old or kids less than 48"), $5 less than last year but you can get discount tickets at local Kroger and Meijer grocery stores for $34.95, or on the Kings Island web site: …cedarfair.com/kingsisland/index.cfm#actions
Kids discounted ticket price is $29.95 for ages 3 & up; under 48" tall / Ages 62 & up.