P.G.
We love www.myurbantoddler.com! It's in Saline, and has a wonderful (affordable - $5) play area that would keep your 28 month old engrossed for hours. It also has a small walled-in baby area so that your 6-month old is trampled. :) Unlike many of the other play places, this one is open on weekends and is not closed "for parties only".