I visited this WHS in July 2014. I spent 1 night and 2 days here and had a great time exploring the island and the nearby Kostanz lake by bicycle. The loop round the island is an easy ride and after visiting the 3 churches and 3 museums, I cycled to the highest point of the monastic island to enjoy the panoramic view. The best church interior and frescoes are indeed the ones of St Georg. For conservation reasons, from May to September 2014, it's only possible to visit at 12:30 and 16:00 with a guided tour in German costing 2 euros.