Originally Posted by
suefalls
Also, in the vein of prior history, if you have had a DWI, you may be denied entry into Canada. Many people have had this happen.
You can get around this by becoming President. (It would have been really hilarious for the Canadians to refuse GW Bush entry, say by making him get back on AF1).
As for passports, IME (not personally, but others travelling with me) expired US passports w/a valid US DL satisfy US border guys & gals. This avoids the worry of losing your current passport.