CoCo's has an extensive drink menu, pearl drinks, smoothies, black teas, green teas, shaved ice, milk drinks (mmmm, avocado), juices, all available with tapioca pearls. I think their pearls, and their big old drink menu, is the best in town. All the juices I've had have been made with fresh fruit. They have a pretty good Taiwanese "snacky food" menu, too -- good, greasy, spicy and cheap (my favorite in this regard is the half order of green onion pie, but there are lots of winners.)
There are two Coco's that I know of. One is on the Drag, next to Veggie Heaven, and the other is up on Research in the shopping center that has the Target and Sunflower Cafe and Din Ho.
Oh, and it's cash only!