Father/son vacation options

Every year my dad takes me on a small vacation, usually short, usually no where overly expensive/extravagant. However, this time I have a few options... A) Detroit Autoshow B) GM/Corvette Headquarters C) Ford Headquarters Detroit Autoshow = one day trip, just the autoshow GM/Corvette Headquarters = most likely all weekend, getting a tour of both (same for Ford). Sorry that this wasn't in the original post, didn't realize I hit tab when I pressed enter Anyways, anyone have some good knowledge about how good the factory/headquarter tours are?