Travelers planning to travel to or through Canada should be aware of heightened entry requirements by Canada customs. Almost all criminal convictions make a visitor inadmissable to Canada, regardless of how long ago they occurred, and include: DUI/DWI, Reckless Driving/Negligent Driving, Misdemeanor Drug Possession, Felony, Domestic Violence, Shoplifting/Theft, as well as more serious crimes. Entry can sometimes be approved by submitting a rehabilitation application.

Many Alaska cruises include a stop in Canada, which may mean that a traveler could be denied entry by the Canadian customs agent. For more information, we recommend that you go to:
http://www.cic.gc.ca/english/visit/faq-inadmissibility.asp