Normally, I think most immigration questions can be answered on your own with a bit of digging, but in your case I would suggest contacting a real Canadian immigration lawyer who has some expertise in criminal inadmissibility cases to figure out your best options.
That said, here's what I found:
According to
http://www.cic.gc.ca/english/information/inadmissibility/conviction.asp, a "reckless driving" conviction (called "dangerous driving" in Canada) if you were 18 or over at the time puts you in the criminally inadmissible category.
So, the question seems to be whether there is some factor that would make you not criminally inadmissible or that would enable you to get rehabilited. First, what was your age at the time - if your conviction occurred when you were under 18, it looks like you'll be ok. Second, if your reckless driving led to any injuries, then it's punishable by up to 10 years in prison (according to this site:
http://www.defencelaw.com/penalty-driving.html, and you would not be eligible to be "deemed rehabilitated" (
http://www.cic.gc.ca/english/information/inadmissibility/conviction.asp#a1), and you would have to apply to for individual rehabilitation.
Dangerous driving without an injury is punishable by up to 5 years (according to that same site), and it looks like there's a 5-year waiting period after your punishment ended before you're eligible for rehabilitation in that case (
http://www.cic.gc.ca/english/information/applications/guides/5312ETOC.asp#5312E3), so you're not in a great spot. If after looking at all of this you decide that you are not admissible to Canada at the present time, it might be better to try to live together in the US until you can be formally rehabilitated.
Finally, my best advice to you is not to try to hide anything, and to make it clear that you are really sorry, that you regret the event, and that you've changed your reckless ways and are now a model citizen.