Lots of lighting and lots of power outlets.
Did you have them put outdoor power outlets around under the eves of the house? Makes for easy Christmas light lighting.
Did you prewire your living room? TV room for suround sound before they sheetrock it in?
Buddy of mine down here did that to his whole house when it was being built. Fugger even has speakers in his closet so when he's getting ready in the morning he is still able to rockout to the news.
Is there anyway to get a heavy overhead beam shored up in that garage, that you can sheetrock up to eitherside of it? I mean that you could weld an anchor to and support things such as an engine hoist? So much easier to store a snatch block then a cherry picker.
No sure if or how your plan on running airlines, but it'd be clean as hell to run and pressure test now so they are all hidden in the walls.
Dont forget speaker wiring in the garage you need sound out there son.
Internet plug in garage, you need a laptop or desktop out there for those quick tech question you need to get on here to answer vs. tracking your dirty greasy ass though your new house for.
That should overload you for a while 
