Nothing wrong with Miami... though personally I'd probably spend the one night and then drive down to the Keys or something. I'd spent there three days once and ran out of things to do (don't know how the fine dining scene is though)

edit: I remind myself Miami supposedly has some good modern art collections. (wasn't in place to visit them when I was there) Thinking back to how offerendums trip reports usually go, I would expect them also to show up.