I recently made a day visit across the US border into Canada at Sault St. Marie. I was admissible (no criminal record) but I got pulled into secondary when I told the officer that I was going to spend a few hours in Sault St. Marie Canada and then return to the USA. My question is, does Canada frown on US citizens making a day trip over the border because of no specific destination versus a US citizen with a specific Canadian destination (prepaid hotel accommodations, etc.)?