Copenhagen fits neatly into a short trip if you pick the right anchors. Nyhavn's colorful waterfront houses make the obvious first stop, and a Canal Tour from there is the easiest way to see the harbor, the opera house, and the palace grounds without much walking. Amalienborg Palace covers the royal history in a single square, while the National Museum of Denmark fills in centuries of context in one visit. For something livelier, Tivoli Gardens blends historic amusement rides with gardens right in the city center. With extra time, a day trip across the strait to Malmö, Sweden adds a second country to the itinerary at almost no cost.