How much pocket money should I bring on a 4 day trip to Chicago?

I'm going to Chicago in a couple of weeks, and I'm wondering how much cash to bring? The hotel and airfare are already paid for, and I'm not much of a shopper, I just want to do more sight-seeing, museums, restaurants, and then small souvenirs for my family. Any suggestions?How much pocket money should I bring on a 4 day trip to Chicago?
Roughly 50$ a day should be good.How much pocket money should I bring on a 4 day trip to Chicago?
i would keep around $60 just to be safe. i was walking around Chicago with a friend with that amount and had a few dollars left over. i was shopping though. i got a jacket and like 2 shirts. then had lunch which was a little over $12. i hope this helps!