I love, LOVE the free kids workshops that Home Depot and Lowe's do! Both of the kids enjoy them, but Buddy Boy in particular looks forward to it. To see the sense of pride and accomplishment in his face after making something is something I'll never tire of:
(I personally prefer the Home Depot ones, simply because you don't have to sign up nearly 4 weeks in advance to reserve a spot...but that's just me!)