Technically, Key West has a strict municipal ordinance (Section 18-87) that prohibits the possession of open containers of alcoholic beverages in public spaces, including streets and sidewalks. This often surprises visitors who see the party atmosphere on Duval Street and assume it has "New Orleans-style" rules. In practice, however, the enforcement of this law is famously relaxed, especially for tourists who are behaving respectfully. Most bars will serve your drink in a plastic "to-go" cup, and as long as you aren't causing a disturbance or appearing highly intoxicated, the local police often choose to look the other way. If you are stopped, the law actually dictates that a verbal or written warning should be given for a first offense before any arrest or fine is issued. However, if you are driving, the rules are zero-tolerance; having an open container in a car is a serious violation. To be safe and respectful of the local community, it is best to finish your drink before leaving the bar or stick to the "hidden in plain sight" approach that many locals use.