Spinalonga Island · 2 hours
10-minute boat from Plaka, 90 minutes exploring: Venetian fortress, leper-colony quarter, island chapel.
Lunch, Plaka · 90 minutes
Waterfront taverna directly facing the island.
Agios Nikolaos & Lake Voulismeni · 2 hours
Walk around the sinkhole-lake at the heart of the old town, coffee lakeside, optional shopping on Koundourou.
Of note: Spinalonga held out against the Ottomans for 46 years after the rest of Crete fell, then served as Europe's last leper colony until 1957. Victoria Hislop's novel The Island has made it internationally famous. Lake Voulismeni is a 64-metre karst sinkhole — local legend long held it connected underground to Santorini's volcano.