Iconic pictures??? The place is always very busy! Also check how many cruise ships will be in port. It can take 2 + hours to get back to the port when cable cars are busy! Option - steps but precarious due to donkey poo and urine . Not pleasant . We walked down from Fira, got cable car back…. Taxis are expensive. Bus station in Fira serves everywhere on Santorini. Oia about 15 minutes by bus €2 . Check the timetable