As far as I understand, Canada and the EUs' prospective counter tariffs are fairly surgical in that they will take aim disproportionately at red states.

In terms of vacationing in the US. Your airlines, hotel chains, restaurant chains etc. all pay federal taxes. Therefore , spending money anywhere in the US, with few exceptions, is Canadian money in Trump's war chest. With that in mind, a general boycott makes logical sense.

The same goes for Costco Canada, Walmart Canada etc, of course. Multinationals all more or less repatriate their profits or franchise/licencing fees back to Mordor.

spending money in the USA is like buying american products: supporting the country economy supports the government. there is no way to travel to the US and keep your money from ending up supporting trump right now

the most impact foreigners can have is to vote with our wallet - something americans often tell us to do - and simply go elsewhere until the right people feel enough economic pain to push the right buttons