Great ice cream, weird environment.
Gannon's is definitely a weird little island. The decor inside is something out of a child's nightmare; bright colors, creepy ice cream statues with faces, and an island theme.
However, the ice cream is amazing, and the hours are long (the window stays open until 10pm, so you can get that late night fix). With flavors like rocky road raspberry, bavarian torte, and austin powers, there's definitely some quality choices here.
Also, don't forget to bring cash, since it's cash only.