I found this recipe at Food Doodles and it was awesome! I used the vanilla extract the 1st time but not since then, I just don't think it made that much of a difference. I also used canned pineapple since the fresh ones were so expensive. I've since made the recipe with papaya instead of mango and it rocked! This is definitely a delicious smoothie and one that you should try playing around with.
Recipe is here - but these are my pics.