If you do not wish to rent a car or other means of transport, you have the following transportation options in Santorini:
1) Thira's Public Bus Service (KTEL): With the bus you can go from Fira to Santorini's villages and vice versa.
2) Taxi: The main taxi rank in Santorini is at the central square of Fira.
3) Furnicular: You can use it to go from Fira to the old port and vice versa.
4) Donkeys: Tradition lovers can try to ride a donkey at specific parts of the island.