Jamba Juice has been one of my favourite lunch spots ever since it was Zuka Juice way back in the day. I got addicted as a freshman in college, and still find myself craving a cup full of that lovely fruity goop. I'd recommend just about any flavour with berries in it (Razmatazz and Strawberries Wild ranking at the top), but the Pina Cowlada and the Caribbean Passion also have a tender spot in my heart.
Despite being packed full of fruit and having the option of adding various free "boosts" to your drink, a Jamba Juice is not the healthiest option out there. They pack anywhere from 300 to 600 calories for an original size drink. However, they have just started offering all fruit smoothies with five servings of fruit and no sugar, which offers a tasty way of getting your five servings of fruit all in one gulp. They're not as sweet as the other ones, but still taste good on a hot sunny day. Or any day, for that matter.
I've always found Jamba Juice a little on the pricier side, but that hasn't stopped me from buying them yet.