Multiple US to Canada border crossings

Will I have any issues crossing from the US into Canada 3 weekends in a row? I’ve been to Canada the last two years on trips and never had a problem. I’m mostly wondering if crossing multiple times in such a short period of time will be problematic.

1. My wife and I are planning on taking an anniversary trip to Niagara Falls.

2. Picking my sister-in-law up from the Toronto airport.

3. Going to the Toronto airport to fly to Japan.