Grand Central Mall has a new kids ride the Grand Central Express and I have to admit, we were among the first in line. :-) The train ride begins in front of JCPenney and goes clear around the mall with no stops and ends right back in front of the play area where it began. It's $3 a person for the 5-6 minute ride and children under 36 inches must ride with an adult (kids under 2 are free with adult). Enjoy this video of the ride.
It's open from 11:00-6:00 on week days and on Sundays from 12:00-6:00 pm
They do charge a fee if you use a credit card so I recommend having enough cash with you.