In Book 7 of "The Odyssey", what craft are the Phaiacians best known for?
The Phaiacians are best known for their shipbuilding skills and their seamanship. The description of their craft is actually found in Book 6, not Book 7, according to eNotes' eText (enhanced) referenced below.
The Phaiacians "are a sea-faring folk, and pride themselves on their masts, oars, and ships, with which they travel far over the sea". Their town has "a good harbor on either side...and...ships will be drawn up by the roadside, for everyone has a place where his own ship can lie". In the market place, "people deal in ship's gear of all kinds, such as cables and sails, and here, too, are the places where oars are made".
The Phaiacians' marine orientation is further evidenced by the temple at the center of the market place. It is a temple of Poseidon, the Greek god of the sea (Chapter 6).