Mykonos and Delos

Treat Delos as an archaeological visit first. The island is a protected cultural site and UNESCO World Heritage property, not a casual independent dive or beach-snorkel stop. Some nearby routes in the broader Mykonos, Delos and Rineia area may be used by licensed operators, but underwater antiquities and seabed objects are strictly look-only. For most travelers, the best plan is to tour Delos on foot, then schedule scuba around Mykonos sites such as ANNA II, Lia Reef, Kalafakiona Reef or Tragonisi with a local dive center.

The core signature set is ANNA II Wreck, Kalafakiona Reef, Lia Reef, Agia Anna Wall and Tragonisi Caverns. ANNA II is a 62 m cargo wreck with guided profiles around 18 m to 36 m. Kalafakiona is known for reef topography, amphora fragments and barracuda schools. Lia is close, fishy and good for mixed levels. Agia Anna offers a wall from shallow water toward 26 m. Tragonisi adds cavern scenery but depends heavily on wind and conservation protocols.

It can affect the trip a lot, especially from June through September and most strongly in July-August. The Meltemi is a dry northerly wind that can make exposed beaches rough, cancel ferries, delay Delos boats and force dive operators to swap sites. That does not mean the island is undiveable. Good operators use sheltered south and east sites and often dive early before conditions build. Snorkelers and freedivers should choose mornings, avoid boat lanes and ask locals which beach is protected that day.

For peak summer, many divers are comfortable in a 3mm suit, especially in July-September when water is warmest. For May, June, October, November, repetitive dives or longer snorkel sessions, a 5mm suit is more forgiving. Freedivers often prefer a well-fitting 3mm to 5mm two-piece depending on tolerance. The Aegean can feel cool after wind, and boat rides can be breezy even on sunny days, so pack a wind layer for surface intervals and avoid relying only on a rashguard outside high summer.

Mykonos is useful for recreational freediving, private instruction and snorkel-freedive crossover days, but it is not a major big-depth destination. The strengths are clear water, easy beach access, boat trips to Rineia or Tragonisi when calm, and local operators listing freediving services or gear rental. The constraints are serious: Meltemi chop, boat traffic, protected seal habitat and archaeological restrictions. Use a buoy, buddy and local guide. Do not enter caverns or seal spaces unless you have the right training and explicit operator approval.

Start with sheltered south and east coast beaches. Lia Beach is quieter and has dive-center support. Paradise Beach is convenient for guided snorkel programs but gets busy later in the day. Kalafatis and Agia Anna have rocky edges and facilities, while Rineia coves are the boat-trip upgrade for clearer, quieter water. Tragonisi can be excellent with a guide and a calm forecast. Avoid exposed north beaches during Meltemi, and keep clear of boat channels, water taxis and private tenders around organized beaches.

Non-divers have excellent options. For a half-day, walk Chora, Little Venice, the Kato Mili windmills and the waterfront before crowds build. For a full day, take the Delos archaeological boat or join a Rineia swim cruise. Beach-focused travelers can use Ornos, Platis Gialos, Paradise, Kalafatis or Agios Ioannis depending on wind direction. Ano Mera adds a slower village and monastery stop. In July-August, pre-book transfers and shade, because taxis, loungers and restaurants can sell out quickly.

There is no destination-wide diver tag or simple marine-park fee for standard Mykonos recreational diving. The more important requirements are using licensed operators, respecting Greek underwater antiquity rules and following conservation conduct around Posidonia, monk-seal habitat and protected islets. Delos has a separate archaeological site admission for topside visitors, and boat transfers or guided tours are separate. If a dive route involves historically sensitive material, your operator should manage the route and guide requirements. Never move artifacts, even small pottery fragments.

Most visitors take a scheduled boat or guided tour from Mykonos Old Port to Delos. The crossing is commonly around 30 to 45 minutes each way, but the schedule depends on season and wind. Budget separately for the Delos archaeological site ticket, listed by the Ministry of Culture as EUR 20 full price with reduced categories, unless your tour explicitly includes it. Go in the morning for cooler walking, bring water and check the return time carefully because Delos is a day-visit archaeological island.