You can park your car in one of the free parking spots in Fira capitol of Santorini and walk the famous path on the cliff side to Oia. 2,5 hours walk , see the sunset in Oia and come back with the bus.
CALL US 
+30 - 22860 81177 -- Book for 3+ or 6+ Days and get Extra Discounts
WHATSAPP RESERVATION +306947022354