Recs for Chicago

Going to be in Chicago for 5 days/4 nights with well-behaved kids (8&6), around the 4th of July. We're stay at the Hyatt Regency on Riverwalk. No car. What are some really good restaurants (no price constraint - just not prix fixe with many courses)? I don't want to schlepp too far from the hotel for dinner, but lunch/brunch can be farther away. Not looking for breakfasts and casual dress a must- we might be in flip flops/crocs.

Suggestions for really good Italian, nose-to-tail, Chinese, things we can't get in DC would be appreciated.

So far we have three dinners covered - Frontera Grill, Roister and the Publican. Looking at Cafe Spiaggia and Piccolo Sogno for the other dinner.