As long as you are flying from a Canadian Airport of Departure to a DR Airport of Entry, I believe you only need your
PR card and your Pakistani Passport and your wife will only need her Proof of Us Citizenship (i.e. passport or
PR card or Birth Certificate and Driver's license). Also if you are traveling with a Canadian package tour operator your Tourist Card is probably included in your purchase price.
If you are traveling through the US please advise as it gets much more complicated after January 23rd, 2007.
Gregg