Ferries are plentiful, tickets are relatively cheap and the bigger boats motor along at a fair link. Indeed, the larger ferries can be close to luxurious with ample bucket seats, air conditioning and well-stocked bars. Expect hard wooden seats, no toilet facilities and a stomach churning ride if the seas get rough. A BAD TURN Greek maps can be a bit of a joke. The main roads are fairly accurately marked in the more populated islands but minor roads routes often bear no relation to the real thing.
Major roads turn out to be minor roads which in turn end up as rough tracks or even goat tracks.
If you do get a map, get one in the Greek language, not English. Most signs are in Greek and do not easily translate into English lettering. English translation on maps and signs can differ wildly whilst the Greek does have the advantage of consistency. Island roads are littered with roadside shrines to those who have lost their lives in accidents. It is remarkable is that there are not more of them given the terrible state of many roads.