Hi folks, does anyone out there have any experience of crossing the border south of Vancouver. We are flying into YVR in 3 weeks and then a week later driving down to Seattle. We have our ESTA done for getting into USA, but not sure what we will need for getting back into Canada a week later. 
Done it both ways several times. All you need is your ESTA and the most you may be asked is your return date.
Going through the Peace Arch into the USA can be slow. As you near the border there will be waiting times flashing up and if it seems to be too long then follow the signs for buses and trucks. That is usually shorter and quicker.
Coming back into Canada is less laborious as they seem to have far more stations open


