The place where you are working from does not impact your current projects, the only problem you should have in mind is if you prospect new clients in the US, you need to warn them that you are Canadian, and you will provide the receipt from Canada, not from US. 

Furthermore, if you are in the country for pleasure, try to keep it that way, only work in your current projects, probably there isn't any law that enforces that you as freelancer cannot prospect new projects using tourist visa, but that is definitely not what this visa is for.