Milan Italy family Travel Question?

My family and I have a 20 hour layover in Milan 9/9-9/10. It's my wife and I plus kids who are are 22, 17,16,15 and 8. We are looking for something fun to do and someplace to stay. We are on a tight budget and like doing "local" back door things.
Any suggestions?

try a sightseeing tour of the nicest monuments, try this link:
http://www.affiliate.viator.com/brochure/product_show.jsp?ID=1010&PRODUCTID=1016&CODE=2872Z V01&AUID=1261

whoa... you have a lot of kids, hang on to them. if the girls are cute, the italian men WILL be after them. and if your sons are cute. hang on to them, they'll be after the italian women... but good luck to them... they're tough! hahahah

You may want to take a basic tour of Milan which should include the entry to the Last Supper. This is a good deal because it is unlikely that you can see it on your own because of long waiting list.
You should visit Duomo and go to the roof. Than hang out and walk around the piazza by the Duomo. If you have time, you can walk around the fashion district.
Ask your hotel about good local restaurants. We had good luck with the local recommendation.
I also have a few pictures below.
Have a great trip.