Daily hydrofoil and ferry service to Poros and other Saronic Gulf islands is offered by Hellenic Seaways (tel. 210/419-9200; www.hellenicseaways.gr). Saronikos Ferries (tel. 210/417/1190) takes passengers and cars to Aegina, Poros, and Spetses; cars are not allowed to disembark on Hydra. Euroseas (tel. 210/411-3108) has speedy catamaran service from Piraeus to Poros, Hydra, and Spetses. For information on schedules for most Argo-Saronic ferries, you can try one of the various numbers of the Piraeus Port Authority (tel. 210/422-6000, 210/410-1480, or 210/410-1441), but phones are not always answered. On Poros, try tel. 22980/22-274, www.greeka.com/saronic/poros; also, www.openseas.gr is a useful site for ferry schedules as is www.gtp.gr.
The other Saronic Gulf islands are easy to reach from Poros. In summer Marinos Tours (tel. 22980/22-297) offers excursions to Saronic and Cycladic islands.
The waterfront hotels are generally too noisy, so if you want to stay in town, we suggest you check with Marinos Tours (tel. 22980/22-297), which handles several hundred rooms and apartments, as well as many island hotels. We've had good reports of Saronic Gulf Travel (tel. 22980/24-555; www.saronicgulftravel.gr), which usually has an excellent free map of the island. To learn more about Poros, look for Niki Stavrolakes's enduring classic, Poros (Lycabettus Press), for sale on the island. The websites www.poros.com.gr and www.greeka.com/saronic/poros have information in Greek and English.