Does anyone know how the US records you exiting the country if you pass from Niagara NY to Canada via the Rainbow Bridge by foot? We are staying in NY and wanted to cross to Canada for a few hours to do the boat ride and then back again as we are staying on the US side. I'm visiting on the VWP. I know my 90 day period will still be valid when going back to the US, but how is my exit into Canada recorded? Anything else I need to know about crossing to and back from Canada?