When you get bored in Athens and you also had visited most of the Isles or just planning change of destination, the airport is always within your reach (10 euro by metro and 6 by bus). Taking a short trip to closests capitals sounds like a good idea, especially when you are too demanding traveller for these two got much to offer for anyone.
Not too picky nor challenging. Usually, hit roads to train at new places, meet new people and relax in wellness while having a quick look at local architecture and historical sites.
SET 4 WIN 