There are tax questions here and visa issues. You probably also want to consider health insurance issues. And then there's the questions about how ok are you about breaking the various laws that you'll most likely get away with.
If you are going to the US to work at all, even for a day or a few weeks, you need a visa of some kind. So if that's your plan, definitely don't tell the border agents. If you are doing multiple multi-week stints, I think you'll definitely get flagged. I'm sure you could likely get away with going to Arizona for 6 weeks every year saying it's your vacation, and working the whole time. Keep in mind though that you are not following the law.
You'll file your taxes in whichever country you've established residency. It's probably not a big deal either way depending on what the state taxes of whichever state you ended up in. Florida/Texas no problem... California, you'll be paying more. The tax will make sure you are just paying the higher of the state/Federal vs provincial/Federal, so no double taxes.
If you are going on visitor rules, and pretending you aren't working, I think you can spend a maximum of half the year minus a day, either continuous or in different trips.
The various health care plans all have different rules you'd have to look into.
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