6 days in greece

The best option for what ?

We just did 10 days in Greece in June. It depends on your objective, but this is the itinerary we would have done, had we do to do it again:
In hindsight, our itinerary would have been 3 nights in Santorini, another 2 nights on a smaller island, 2 nights in Athens, 2 nights in Nafplio, and 1 night near Delphi. We would have skipped Peloponnese altogether or only gone to Limeni on Mani peninsula. If you have lots of time to drive, then perhaps its worth it. We must have spent 14+ hours in the car going to Mani and it wasn't worth it to us. We didn't even include Delphi, Olympia, or Monemvasia.

You can see our original itinerary thread here:
https://community.ricksteves.com/travel-forum/greece/skip-peloponnese-lots-of-driving

hi carla just wanted a travel advice as i have only 6 days in greece.if you have any ideas please advice thanks.hanif

harif if you tell us nothing whatever about your interests, how can we advise you sensibly? Do you want info on ancient sites, or nightclubs, or shopping, or dining? Do u plan to stay entire time in Athens, or want to do overnight trip(s) too? You may be a very busy executive who has no time to find out stuff even by googling, but instead is accustomed to zipping out brief inquiries on his smart-phone and have employees research and come up with a boatload of answers. However, we are not employees. Spend some time to give us details on your interests, if you want help.

With such a short time your best bet would be to stay on the mainland. You could rent a car and go North to Delphi and Meteora for three nights and spends the last few in Athens before your return flight.
Olympia Delphi Meteora https://www.flickr.com/photos/stanbr54/sets/72157645469717811/

Or alternatively you might consider Nafplio. On the way stop at Corinth and visit ancient Corinth and Ancient Nemia. These are two small but excellent sites. These two sites will only take a couple of hours. Then head south to Nafplio. It is a lovely seaside city with two Venetian Fortresses and an old town area. Spend three or 4 nights in Nafplio and do some day trips to the ancient sites nearby then head back to Athens for your last few days. It is always a good idea to be in Athens at least a day before your return flight.
Nafplio and Peloponnese http://www.flickr.com/photos/stanbr54/sets/72157632094108982/

Good advice from stanbr, split the time between Athens and EITHER Nafplio OR Delphi.