Margaret Island, known locally as Margitsziget, is a calm green strip in the Danube between Margaret Bridge and Árpád Bridge, where you can switch from city noise to park paths, medieval ruins, and spa time in minutes. The island's story reaches back at least to 1225, and today it still feels like Budapest's easiest reset button.
For a first visit, choose a guided island tour, because it helps you cover key spots quickly and leaves time to add a spa ticket for a more relaxed finish.