Normally, Chuck E Cheese sends out Free Token offers, not Free Ticket offers! Just play the Chuck E Cheese Game and you can get 30 Free Tickets. You can redeem those tickets for anything that is 30 points or under.
Plus, it looks like you can play as much as you want. So, you could start getting a lot of free tickets! However, you can only redeem 30 tickets per child, per day.
(Thanks Savings and Stewardship)