I prefer H1 and H4. But take AP with you in case something happens.
2. we just want to landing Canada and come back U.S. without stay in Canada over night, is it possible?
Yes.
3. should we apply SIN and import our car,and otehr properties?
Prepare "Goods to Follow" list. do not import your car. get a rental car. You can apply for SIN.
4. do we need to do canada tax return at end of year if we do not stay in canada?
No.
5. we need to apply P.R. card when we landing Canada, since we do not stay at Canada, could they mail to us? which address I should gove to them? U.S.? or canada?
Canada address.
6. what kind of questions could they ask? May I tell them I am going back to U.S. after landing?
It is your call. Telling the truth may be good.
7. when I re-enter U.S., should I tell U.S. that I was landing canada if they ask?
It is your call.
appreciate any info!
Thanks!