Bruges is officially one of my favorite towns in Europe. It is small, old, clean, well maintained, has windmills and easy access to the sea, and is smack in the middle of a huge area of farm land. We were there for three nights, and I felt that was plenty. On our first full day we rented bicycles from the nearby hostel and rode northwest to Damme on small farm roads. We stopped for lunch on the back patio of a local restaurant, and then rode back into town through the tree tunnels.
On our second day, we walked around town, went on a brewery tour, had lunch in town, and then walked around some more. It was the perfect escape town, and if I lived in Brussels or Amsterdam or even Paris, I can imagine going there for a weekend getaway.