Pina Colada smoothies are all over the web, but I decided that instead of trying to copy one of those, I would just use the basics (lime, coconut and pineapple) to invent my own. Adding a half of a lime — peel and all — is one of the tweaks that makes this my favorite smoothie ever. You can add rum if you’re making these for a party… or just leave it as it — excellently awesome and full of pizazz!