Use a cocktail shaker, pour over ice:

Parrot Bay Coconut Rum (hence the "parrot")
- 1 oz.
Capt. Morgan's Spiced Rum (arrr, pirates have parrots) - 2 oz.
Blue Curacao - 1 oz.
Grenadine - splash (or 1 oz.)

Shake, and it turns purple!
Very coconutty, very tropical.
(If it is too much coconut for ya, add 1 oz. of banana schnapps)