Santorini sunsets from Oia are legendary and also — if you've ever tried to watch one — a human stampede. 4,000 tourists cram into Oia's cliffside streets between 7 and 8 PM, and the best viewpoints are standing-room with camera phones in every direction.
Sunset from the water is the cheat code. You are in the caldera, looking UP at Oia as the sun sets behind it. Catamaran cruises depart around 3 PM, swim stops at the Red Beach + hot springs, then BBQ dinner on deck as the sun drops. You watch the light change on the white villages from the water, uninterrupted.
Skip the "budget" big-boat cruises — 50+ passengers crammed on a repurposed ferry. Catamaran is 10-20 people and actually luxurious. The $100-200/pp difference is worth it.
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