Chinese restaurants have never been known for serving health food, but Dragon Well comes closer than most. On a lunch date in the Marina, chew like an elated goat on vegetarian tofu salad while sipping iced tea with a fleshy litchi globule floating in it. Here, there's no need to excavate the kung pao from blankets of grease; most everything is light and tasty. Bathed in sunlight from huge bay windows, you can daydream of faraway shores over salt-and-pepper calamari or steamed Hawaiian butterfish. Pan-fried shiitake mushroom pot stickers with ginger soy sauce clog the innards briefly, only to be dislodged by steamed pea shoots stung with garlic.