Here’s the deal, and the Flyertalk thread.

Use promo code GOCANADA to take $600 off the package price, airfare for two people with hotel and minimum spend of $750. Book by December 31st 7 p.m. eastern time and travel needs to be complete by April 30. Each traveler will also receive 5000 bonus United miles per reservation.

Cheapest options will usually be two night stays for two people.  Of course you only get $300 off per person, so you’re better off booking for two even if traveling solo.  There are some nice properties available with this promo as well, including three Fairmont properties — one of which will also throw in a $100 food and beverage credit to boot.