Beijing Chinese Seafood   This hidden gem is very much on the radar of Japanese tourists and international business travelers. It's a beautiful space of wood, stone and starched linen. But it's what's on the plates that counts, and that's where Beijing Chinese delivers. Try the won tons in spicy garlic and chili or the soup noodle with spicy Szechuan beef brisket, and you must order the fried scallops, delicately coated with a lightly seasoned breading and flash-seared — perfect little moist pillows of sea essence.  Royal Hawaiian Center, 2301 Kalakaua Ave. 971-8833. www .beijinghawaii.com. 11:30 a.m.-2:30 p.m. Fridays-Wednesdays, 5-9:30 p.m. nightly.AX, JCB, MC, VS. $$$.