This is a set of Google Maps that you may want to check regarding your Athens visit:
Enjoy :)
AthensAttractions is a map including pinpoints for most of the usual attractions. Map includes museums locations and metro stations too. This is a general reference map.
Acropolis and Agora walk is a reference map for a half day visit to Acropolis of Athens and then the Ancient Agora site. Keep in mind to start really early from Acropolis subway station, since the whole place gets really hot during the summer. This is a suggested walk path for cruise ship passengers also that are in Athens for only a day.
Athens Museums is a map including major museums and subway-to-subway walks to visit them.Generally speaking each walk needs one day of your visit. These are walks including many more sites and things to see / do in between, so consider this when planning.
Athens freebies and other is a map of things to see 24/7 or do for free in Athens. List contains more than museums. So, ancient sites and museums that are free or have no fence so work 24/7 are included + markets, small monuments and so on. You really don't have to spend a fortune to see Athens:) Basic subway stops and key points are also included in the map.