Kiddie Park is a fun place for small children (maybe 10 and under since there is a maximum height on most rides). Ride tickets are .25 each and you can ride most for one ticket. One great thing about this place is if your child cries and needs off during the ride, the attendant will stop the ride and let your child off and return your ticket to you.
Concessions are affordable - they offer cotton candy, sno cones, pop, pop corn, etc.
Also, the last train ride of the night is always free.