How to get around Santorini
Take a taxi.
Pre-booking not necessary from the ferry port, but recommended from airport.
Hotel Shuttle Bus.
More than likely, your hotel should have a shuttle bus with services to and from the ferry port, airport and into town.
Buses are air-conditioned with lots of luggage storage. They cost about €2 a trip (a little more from the ferry port to Fira). The hub of the bus network is Fira so most trips that don’t begin or end in Fira will require changing buses in Fira. There will be a bus waiting for all ferry arrivals regardless of the time. Buses also stop at the airport though this can require a wait of 30 minutes to an hour depending on the schedule. In the summer months buses run from Fira back to the beaches until well past midnight.
Rent a car.
Renting a car is an excellent way to get away from the crowds and see the island at your own speed. Buses go almost everywhere but if you want to see more than one attraction in one day then figuring out bus schedules and changing buses gets tiring very quickly. Most cars have a standard transmission, so book far in advance if you want an automatic.