We took a taxi to Fort Qaitbay (built on the site of where the Alexandrian Lighthouse originally stood) and had a good look round it. You need to haggle the taxi driver down to a fair price before boarding the taxi. This was worthwhile and there were some good views of Alexandria from the ramparts. The promenade seemed at first pleasant enough to walk along but what spoiled it was the constant hassle of taxi drivers trying to persuade us to take trips with them and they wouldn't take 'No' for an answer. Walking back to the ship through a side street, we saw much filth and poverty.
At Aghios Nikolaos, we took the land (fun) train along the coast and got a good view over Spinalonga and Elounda, returned to the ship for lunch and walked around Aghios Nikolaos in the afternoon. A pleasant town, with a lake that joins up to the sea.
The ship docked at Piraeus. We took an open-top double-decker tourist bus from next to the port. Having bought your ticket, you can go on it into Athens, then change to another bus to visit any of the sights in Athens / have a round trip, getting on and off as much as you like. This worked out cheaper than taking a Thomson excursion, even allowing for us having to pay to visit the top of the Acropolis. The latter was certainly worthwhile, although the Parthenon was having much work done on it when we were there.
A pleasant town to wander round. We saw one of the two resident pelicans. They charge ridiculous prices for a coffee in a cafe, though. In fact, prices of things in Greece seemed high generally, presumably because of the economic collapse there.
We walked over to Pigeon Island in the morning. The ship was easy to go back onto for lunch and we wandered in the other direction along the promenade in the afternoon. There is a smallish beach which we laid back on. Unfortunately, the Marina is not visitable as you're not allowed in unless you own a boat there. All in all, it seemed a good holiday resort.