Pavlov may have done it first, but some Portland restaurants and bars do it even better. We're talking about rewards — tangible prizes with a side of glory — designed to encourage customers to come back again and again.

For $35, you can purchase a McMenamins passport and embark on a journey to visit all 62 locations, from Roseburg to Mill Creek. Earning stamps requires completing certain tasks, like seeing a movie or taking a tour, and grants perks like a free burger or gift card. The ultimate goal is to finish the booklet and achieve the title of Cosmic Tripster, which comes with an invitation to an exclusive party, happy hour prices for a year, hotel stays, and concert tickets.

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German beer halls Stammtisch and Prost! both offer a Stein Club with various benefits. By turning in full stamp cards, you can drink your way to your own bar stool or lederhosen.

At Pope House Bourbon Lounge, it's a race to the finish line (tasting 50 different bourbons) and the right to hang your lucky horseshoe on the Bourbon Derby Wall of Fame.

Know of any incentives that we missed? Send them our way.