As a rule, perkiness is annoying. But politeness, freshness, brightness? All good. And in the morning hours, even better. That's what you'll get when you stop in at Jamba Juice for a healthful taste sensation. Left Coast influences (the California-based Juice Club became Jamba Juice in 1995) have obviously infiltrated Jamba Juice's Kendall outpost, which features a tremendous menu of fruit- and soy-based smoothies plus a fresh-juice bar (even wheatgrass grows in patches behind the counter). Ask your upbeat server to toss in a free Jamba Boost (select vitamins, minerals, herbs, and amino acids) for immunity, women's health, or energy, and you'll be treated to a pick-me-up that packs more of wallop than anything you'll get at that gloomy Starbucks next door. Creamy smooth drinks are filled with the fuel your body needs any time of day: Combinations of berries, bananas, peanut butter, peaches, mangos, and more mingle endlessly with nonfat yogurt, sorbet, and ice. Nothing artificial here -- even the shiny happy people who man the blenders and make sure every last drop finds its way into your jumbo cup are genuine. So if they want to be perky, we'll just go ahead and let them.