There doesn't seem to be any hassles going to or coming back from 
Canada. Passports aren't needed at this point, however, I have been there on 3 occasions within the year and I have begun to take a passport along. It definately seems to speed things along. The same goes for the return trip. The Canadian folks seem really nice at the border, it is the USA that seems to assume we all must be smuggling something!
    One suggestion is to take a trip to your local bank about 2 weeks before you go and exchange some U.S. money for Canadian currency. It usually takes a few days for the bank to get the money. It also helps to use a credit card for fuel purchases and the like. The credit card company will give you the correct exchange rate on your purchases for the day of your purchase.
                          Cal