Greetings! My wife and I will be arriving at ATH at 1am from LHR. I am considering options. We only have 3 days in Athens before getting on a cruise, so I am trying to balance resting from our trip over against going straight to our hotel at 3 am and then sleeping until who knows when and missing out on most of a good travel day. Plus, it seems like it's not really worth the cost to pay for a half night.

I was hoping to find an airport lounge we could hang out in for a few hours rest before catching the train when it starts at 630am. It would be great if I could find a lounge at ATH, and even better if I could use the same access to get into a lounge at LHR in either Terminal 3 or 5, as we will be at LHR for 8 hrs and transiting from terminal 3 to 5. I don't have any airline status to speak of, but I am definitly open to signing up for another card, or just paying for the access flat out.

Specificly Im wondering:
- Is it possible to go into a lounge after arriving at ATH from LHR, or would we have to be flying again for this to even be possible?
- Are there any lounges that could be used at LHR T3 or T5 AND at ATH?
- How much should it cost to catch a cab at 2am into the city, and would it be safe to do so? If we did that, any thoughts on what to do around 3am when we got there besides check into a hotel and sleep? At what time could we expect things in Athens to start opening up on a Friday?
- Any other ideas for a side trip at that time of night and how to get there? I'm thinking maybe we take a cab to a train station that is still running and catch a middle of the night train to be somewhere awesome by breakfast?