Last time I went (couple years ago) most of the area that boarder the US our bucks work OK. You need to look, usually usd are worth more on the exchange, so they are happy to take them. I took some Canadian bucks with me like $50, mostly I used one credit card I had called and told them I was going. When you use a credit card it figures the exchange rate automaticly for that day. Always worked good for me. Passport, an insurance card from your company with the Candian requirments. If the agent at the boarder asks you any questions at their shack, DONT step up to the window!!!!! I seemed to occupied her space and she didnt like it. Check wait times where your going to cross. Some have really long wait times.