We got our youngest an Erector Set for Christmas/Hannukah. I had one as a child and wish I still had it. I spent hours building with it then made up and engineered my own designs.
He and I worked on the crane all Christmas Day. Well, he did most of the work. He had to re-engineer some to make it work. I think he's going to get a lot of enjoyment from it. It has a cool little power driver that came with it.
I also got a Black and Decker 3.5v screw driver. My old one finally gave up the ghost so my inlaws gave me a new one. They don't know it yet because I haven't told them. I spent some time yesterday just playing with it. Finding all sorts of screws that needed removing from something. Heaven.
It's all about the simple things.