Sour, just curious, but do you eat the entire lime, peel and all? :P
I'd say my favorite is the plain ol' banana, but recently I've been getting into acai, as well as some other things. My favorite is this place called Tropical Smoothie Cafe. Great smoothies, though a tad pricey, but at least I know they're just fruit and ice going in. Been in the back with some of my friends. Great stuff, as well as their non-smoothie stuff. All in all a healthy place to eat, satisfying my need for fruits
I would say that my previously mentioned favorite is probably so due to me being too lazy to get a sufficient amount of potassium elsewhere, besides bananas just tasting good :P