Don't think they have refillable mugs at OKW or BWV. We bought a mug at the bakery on Boardwalk that is refillable but for a price. It is not self-service. Can't remember how much it was, though. Wilderness Lodge does have the refillable mugs at Roaring Forks, which is a part of the hotel. We bought them in November and enjoyed getting hot cocoa and marshmallows at night. (It was cool last November.) Hope this helps you plan!