Add gin, cointreau and lemon juice to an ice-filled shaker. Shake for 30 seconds and strain into a cocktail glass. Garnish with a lemon twist, and serve.
Pour the Frangelico hazelnut liqueur, creme de bananes, pineapple juice and bitters into a cocktail shaker half-filled with ice cubes, and shake well. Strain into a cocktail glass, and serve.
Combine all ingredients except cinnamon in a blender and blend at high speed until smooth. Pour into a chilled margarita glass. Sprinkle the top with cinnamon, and serve.