There is no nightlife in Thirassia. Once the 4.30pm ferry to Santorini has gone, that's it. The island settles down to snooze. There are no bars, no souvenir shops, only two or three restaurants. No beaches. One place to stay (rooms just above the main village, Manolas, on the single track to the south of the island).
But if you want the smell of wild thyme, a stiff breeze blowing off the water, mountain scrambles, deserted hermitages, and the sound of distant mule bells; if you're prepared to bring your own lunch, and get up early for the eight o'clock ferry, Thirassia will give you an unforgettable day's walking under the blue sky of the Cyclades. Time enough in a day to walk the entire length of the island, bag its peak, and still have time to sit and admire the view of Santorini from the other side.
Is this your business?