What to say at the border??

[Hastezini]

I am a US citizen, married to a Canadian citizen.  I have been living here for almost 6 mos at a time, and going back to the US before my tourist stay expires, and staying several weeks.  I have no visas.  I have to go back to the US in a couple of weeks by car, and I am not sure what to say at the border.  Do I say I am married?  Do I mention that my application for permanent residence is in process?  Or do I just try to give minimal info without lying?