Little boys will love the idea of working like daddy in the garage and everyone will appreciate the fine motor workout you can get from matching nuts and bolts. This idea (and several more in the same post) from Counting Coconuts.
Hands-On Pumpkin Math with The Geo Pumpkin - A fall twist to the classic geoboard. Hours and hours of fun for preschoolers. Wonderful way to practice fine and gross motor skills, explore math concepts, and just have fun!