Ferries to the island of Ven depart from Landskrona harbour roughly hourly in summer, with the crossing taking about 25 minutes. Ven is flat, quiet, and perfect for cycling — bikes can be rented at the ferry terminal on the island. A circuit of the island takes two to three hours at a relaxed pace and takes in the Tycho Brahe Museum, the ruins of his observatory, the working farmland, and the clifftop views toward both Sweden and Denmark.
The Tycho Brahe Museum at the centre of the island tells the story of the 16th-century astronomer who made Ven his base for two decades. His underground observatory, Stjerneborg, has been partially reconstructed and can be visited. The museum is modest but earnest, and the setting — in what was once the island's church — gives it an odd, appropriate solemnity.
Plan a full day for the trip. The harbour has a few small restaurants and cafes; the island's farm shop sells local produce. Book ferry tickets in advance in July and August.