Review for Diamond Jo Casino Dubuque Review For Tree Bar Google User Mar 5 '19 at 15:45 Came here for my birthday last month. Staff are always welcoming. It's a nice casino and had a good time. The Cherry Lanes bowling in the upstairs of the casino is a lot of fun! The River Walk is across the street behind the Grand Harbor hotel and is a nice walk when it's warmer outside. View full site to comment or like