South Naxos reef dive near Alyko beach with a GPS-based boat approach, a reef that starts shallow and works down to mid-depth, and a strong macro focus. Trapezaki fits open-water divers, beginner courses, and refresher dives when you want a straightforward reef loop with nudibranchs, octopus, and a small hot-spring feature in the rock. It is best treated as a calm-day boat plan rather than a casual swim-out.