Ærø is a small island off the south coast of Funen, quietly doing things the rest of Denmark is still talking about. It runs almost entirely on renewable energy — wind turbines generate most of the island's electricity, and solar collectors feed hot water directly into the district heating system of centuries-old towns, cobblestones and all.
The main draw is Ærøskøbing, one of the best-preserved small towns in Northern Europe. The streets are narrow, the timber-framed houses are intact, and many of them are available for weekly rental — you can live in a 300-year-old merchant's house rather than just photograph it. The town has a few small museums, including the Bottle Peter's Collection, a ship-in-a-bottle collection that sounds odd and turns out to be genuinely absorbing. At the other end of the island, Marstal is the old seafaring town, with the excellent Marstal Maritime Museum recording the days when the island's tiny population owned hundreds of ships.
Beyond the towns, the island is good for cycling, kayaking, and horseback riding. The cliffs of Voderup Klint on the south coast and the pastel beach huts outside Ærøskøbing are the most photographed natural sights. There are campsites along the coast. The pace is slow and the distances are short — the island is about 30 km long and easily covered by bike in a day.
Getting there means a ferry from Svendborg on Funen (about 75 minutes to Ærøskøbing), from Faaborg, or from Fynshav in southern Jutland to Søby at the island's northern tip. The island is popular in summer; book accommodation well ahead if you want to rent one of the old houses.