Our first port of call was Athens, Greece. It was a very neat city with lots to do. Here is everything we could cram into 6 hours.
Just like swimming, but without the water.
This Church saved us when we were lost. It is very near the port. At the first of the day they picked us up in a bus and carried us off towards the Parthenon. They dumped us off in the middle of town (voluntarily) on the way back so we could goof off. We caught a taxi back to the port but none of us (including the taxi driver) knew where that was. But we remembered this Church, which she did know about.