I am visiting at Warsaw next week with my family and we were wondering is there an american style sunday brunches available? I've heard that Hyatt has one, but any other choices and which is the best one?

Also we haven't book the hotel, yet. We are between Hyatt, Marriott and Hilton. All seems to have good suite options. Any suggestions for three night stay? Our goal is just see the city, do some shopping and have a few good meals

By the way is the any must-do's in the city for the 30-something couple with 2 yr old boy?