The East Area YMCA is the most popular:
East Area Family YMCA- Home Page
A couple others (in the eastern suburbs) I know about
:
Bally Total Fitness, DeWitt
Gold’s, DeWitt
Places for kids to play? Well, there is always Chuck E. Cheese!
There is one in DeWitt.
If you name a few places where your kids frequent to have fun in metro Detroit, I'll be able to tell you if similar places exist in the Syracuse area....(?)