depends on your background
if you have no strong ties to canada, your application might also be refused although you are p.r.
ususally you may apply for B2 visa and submit all supporting documents listed(but not limited to) on officail website of us embassy to cananda.
you may book an interview schedule online and complete all the forms required, such as DS156.
as you apply for B2, you have to provide itinerary, when and where you plan to visit.
wish you a good luck.
if you return canada via us, you may have troubles at customs as some officers might check all your luggage very very carefully.
