Ráckeve is a small town on the southern end of Csepel Island, about 40 kilometres south of Budapest. It sits by a quieter branch of the Danube, with a modest centre, a Serb minority history, and enough architecture to make a good slow day from the capital.
The town's best sight is the Our Lady Serbian Orthodox Church, a rare Gothic Serbian Orthodox church with medieval frescoes and a Baroque bell tower. Ráckeve's other strong landmark is Savoyai Castle, an early Baroque palace by the Danube associated with Prince Eugene of Savoy. Between them are small squares, churches, galleries, and the reconstructed water mill on the riverbank.
Ráckeve is not a big-ticket Hungarian destination, and that is part of its use. Come for a half day if you are already in Budapest and want a small Danube town without the crowds of Szentendre or Visegrád. The HÉV suburban train makes it easy, though the trip is slower than the distance suggests.