For a truly exclusive and romantic treat, dine in a wooden lighthouse on an island in the middle of Oslo Sound. Just 20 minutes by boat out into the Sound, you're guaranteed of getting superb service, a highly entertaining and sociable evening, and a fresher than fresh seafood menu of Arctic char, baked trout, or massive shellfish platters. It's expensive, but well worth the experience, especially if you eat on the terrace in mid-summer when the sun never quite manages to set. Perfect for that surprise proposal, so go the whole hog and order vintage champagne. Reservations required.