Oceana Seafood  style restaurant, Located at: 55 E 54th St. Manhattan, NEW YORK   Phone Number 212-759-5941           Hours of Business: Dinner nightly, closed Sunday.           Average Price: $65                   The dining room of this multilevel restaurant has the feel of an elegant ocean liner. Rick Moonen's creative prix-fixe menu sets sail for seafood highlights that include various tartares, pan-seared fillets, and other treasures from the sea, all splendidly prepared. The upstairs bar affords a quiet, elegant spot for a drink.