Tinos sits just north-west of Mykonos, close enough that on a clear day you can pick out its hills from the Mykonos waterfront. The crossing is so short that most people spend longer queuing to board than they do at sea, which makes this one of the easiest island pairs to combine in a Cyclades trip.
The contrast between the two is the reason to go. Mykonos is beach clubs, nightlife and crowded lanes in high season. Tinos is known across Greece as a pilgrimage island, home to the great church of Panagia Evangelistria above the harbour, and for its marble-carving villages, dovecotes and a serious food scene built on local cheese, capers and artichokes. Many visitors find it feels far more lived-in than its famous neighbour.
Because the sailing is under 40 minutes on every vessel, Tinos works either as a day trip from Mykonos or as a calmer second base. From Tinos you can carry on to Syros, Andros, Paros or back towards Athens through Rafina or Piraeus, so it fits neatly into a loop through the northern Cyclades.
Before you book, check which ship you are on rather than just the time. The conventional ferries of Blue Star and Fast Ferries sail daily and carry cars, while the high-speed boats of Seajets and some Golden Star sailings are faster but pricier. Around the big church festivals, especially 15 August, Tinos fills up with pilgrims, so book both the boat and your bed early for those dates.