If you were looking to get away from the heat of the city, Aegina is the perfect island to go to. It is a pretty quick boat ride from Piraeus and you can explore both ancient ruins and remote villages. The island is pretty big so I recommend you get a car or ATV/motorcycle. The island has amazing pistachios with many different traditional desserts made from the nuts. You can find many pistachio stores lined up right outside of the port that sell pistachio butter, pistachio brittle and pistachio honey. I always get a few pistachio souvenirs for my family and they love them!