From Sorrento/Nerano: Amalfi and Positano Boat Tour

Once on board, the boat tour will depart at 9:00am from Marina del Cantone. First, you'll sail around Li Galli island, where the myth of Ulysses and the Sirens is said to have been set. Then your boat will head to the Ancient Marine Republic of Amalfi where you'll enjoy 3-3.5 hours of free time to explore the town.
Don't miss seeing the main local attractions such as the Cathedral and the Cloister of Paradise. Enjoy some time on the pebble beach, tanning and swimming in the azure waters. You may also want to shop for local products like the world-famous Amalfi Coast lemons and limoncello. 

Next, sail towards Positano, where you'll also have about 1.5-2 hours to yourself. Admire the picturesque Furore and the beautiful old town of Praiano. On the return trip, you'll find the Fjord of Crapolla and the enchanting Islet d'Isca that belongs to Eduardo de Filippo. Finally, arrive back at the port at about 5:15 PM to catch your shuttle back to your accommodations.