Today is my dad's birthday and I need suggestions on what to get him.  He's one of the hardest people I know to buy for.

I could make it super easy on myself and get him a gift card but I want to do something more fun than that.  He's into hunting and shooting sporting clays.  From past experience, I know he doesn't do Hawaiian shirts but otherwise he's not too picky.

Help! What do I get him?