The best place on the island for information and help getting a hotel room, boat tickets, car, or motorbike (and arranging hiking excursions) is Aegean Thesaurus Travel and Tourism, with offices on the port (tel. 22840/32-152; www.thesaurus.gr) and on the main square in Apollonia (tel. 22840/33-152). Aegean Thesaurus handles tickets for all hydrofoils and ferries. Check at either office to get the helpful information packet on Sifnos for 2€. Just off the main square in Apollonia, Xidis Travel (tel. 22840/32-373; www.xidis.com.gr) is another good travel agent.
Visitor services are centered in or just off the main square in Apollonia. This is where you will find the National Bank (tel. 22840/31-317), with an ATM; the post office (tel. 22840/31-329); the telephone office (OTE); the police (tel. 22840/31-210); for medical emergencies call tel. 22840/31-315. The municipal website www.sifnos.gr is useful.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.