Here is the fine print from the con­test website:

“Begin­ning approx­i­mately Decem­ber 1^st , 2011, while sup­plies last, pur­chase a spe­cially marked pack­age of Cen­trum^®, Cal­trate^®, Advil^® or Advil^® Cold & Sinus prod­ucts and peel off the plas­tic label to find a unique alpha-numeric code. Visit www.spinUwin.ca to reg­is­ter and find out what you have won. Con­test closes August 31^st, 2012 at 11:59 PM, East­ern Stan­dard Time (the “Con­test Clos­ing Date”).

To par­tic­i­pate with NO PURCHASE NECESSARY, clearly print your name, mail­ing address and a tele­phone num­ber on a plain piece of paper along with a min­i­mum 100-word essay telling us what you like about Cen­trum^®, Cal­trate^®, Advil^® or Advil^® Cold & Sinus and mail to: Pfizer Con­sumer Health­care “Spin U Win” Con­test, No Pur­chase Request, 4412 — 14th Avenue, Markham, Ontario L3R 0J3. Limit: one (1) non pur­chase entry per house­hold. You will receive back in the mail an alpha-numeric code. Visit www.spinUwin.ca to reg­is­ter and find out what you have won. All requests must be received by August 15^th, 2012 and become the prop­erty of Pfizer Con­sumer Health­care (the “Sponsor”).”

Grand Prize:
Trip for two for a choice of 1 of 3 Rivers of the World cruises.  Approx­i­mate Value $25,000 (CAD).  Cruises includes a choice of one (1) from the fol­low­ing: Nile, Yangtze and Rhine/Danube.

Every­one Wins Prize! $40 Value Coupon Book­let:
Min­i­mum prize to be won with valu­able high value coupons on par­tic­i­pat­ing brands.  The approx­i­mate retail value is $40.00 CAD.

Click here for more infor­ma­tion on this contest.