Although it sounds as if your experience could have been better, I personally take the stance that the customer should also put some effort into making their trip to an establishment as pleasurable as possible.

If you were expecting a free dessert/gift etc. you should have called ahead to see if they do that sort of thing. In fact, if you visit their website you will see that you could have called ahead and booked a party. Even if it was just going to be you, your girlfriend and your 3 year old, they may have been able to charge you for a party accordingly.

I agree with other posters who have said that something should have been mentioned to the manager. I know I tend to lose my temper in certain situations, so as a last resort I would have called the manager after leaving. Once I had a chance to cool down I would have called back and complained about the drink and pizza. HOWEVER, most child geared establishments such as Chuck E Cheese do not carry quality food. You are essentially paying for the atmosphere. As for the drink, are you sure that it didn't taste bad because of the alcohol content? I know where I used to live some restaurants were only aloud to add so much alcohol to a drink because of state law. Some drinks in this case tasted very watered down.