- Aegean Thesaurus Travel & Tourism was established in 1987, the only travel agency to operate on Sifnos Island. We offer a wide range of services including the following: Reservations for hotels, apartments, studios, private rooms (pensions), traditional houses and villas in Sifnos and other islands of the Cyclades. Guided sightseeing and hiking tours. Excursions by boat. Special interest ...www.travelling.gr/sifnos-aegean-thesaurus