We had planned to get a metro to Athens but the line was down so took a taxi for 30 euro instead. Got dropped at the heart of the city, however the queue to get in took forever, one tiny booth to process 100 plus tourists - not very impressed! Having visited the Acropolis (which was well worth the wait) we came out of the site a different way and came across the main entrance which i guess would process people a whole lot quicker. We had a wander around the Plaka and then caught the bus back to port - nightmare journey, packed bus, no air conditioning and we heard of one woman from our cruise who had her purse taken. Wouldn't recommend it and suggest a tour or taxi both ways.