As I understand it the rules are:
1. You cannot have an open container while sitting in a golf cart. The rules
are the same as though you were on the side of a road and had an open container
2. You cannot take a drink out of one of the restaurants and walk around with it. The license to drink is with the establishment and the drink is to stay on their property.
3. If you buy a drink at one of the little booths around the square you can walk around with it as the area is identified as a "tourist" area and under Fl.
law you can carry the drink around the square.