We got our PR in June 2011 (entry port Toronto) and exited the country. Obviously passport had single entry visa at that stage.
Now we are coming to Calgary with bag and baggage this month end. Will a valid passport and PR cards be the only documents required to allow the travel ? Or is there any other document that I need to be carrying ?
Valid passport and PR Card is all you need. You still have time to meet the residence obligation so entry should be fairly smooth although with the length of absence you may get sent to Secondary Inspection.