Early next May, on a Friday, I will have a long layover in Athens and want to travel solo straight into the city just to visit the new Acropolis Museum. I will want to keep this escapade relatively low-cost, so I'll be relying on public transportation.
I have a domestic flight from Heraklion landing at 7:30am, so getting out the airport door should be quick. I then catch the next Aegean flight at 3:30pm, bound for Budapest - so I'd like to get back to the airport a couple of hours before then.
All told, I'm looking at a "safe" window of approx. 5 hours: travel time into Athens plus visit to the new Acropolis Museum. The Museum will be already open by the time I get there and I'll probably just grab a bite in the museum itself before I head back to the airport.
My last time in Athens was decades ago, so my frame of reference is irrelevant now... and I would appreciate your advice as to how best to do this. I assume that taking the metro would be the best option?
Also, I will have my carry-on daypack with me, will I have to check it in at the Museum? If so, where would be the safest place for it: the airport left-luggage or the museum? Do either of these involve a locker that you lock yourself or must you hand the bag over to an attendant?