Funicular from Santorini to Santorini (city)
The most comfortable way to beat the cliffs at Fira is by cable car. If you come ashore by tender boat, you will see the entrance on the left side of the wharf. There run 6 cabins with 6 passengers each on and off. So normally the waiting time is not so bad, though at peak times, there can be big lines. A ticket costs € 5 per person (one way).
TIP: Take the cable car to the top and on your way back descend via the walking trail. So you combine the best of both.