Not sure what timeframe your asking for... a few nights on Santorini, etc. or a cruise to a few islands, or something else. But, you can take a day trip via hydrofoil to the beautiful, quaint island of Hydra (no vehicles, donkeys only!) and Poros. We did both isands on a day trip from Athens... then from Poros took a 'boat taxi' to the Peloponese where we hired a taxi to be our guide/driver up the coast to Epidorous and then onto Corinth where we caught a bus back to Athens. It was a very long day... may be better to do it in 2 days but fun and we saw sooooo very much! Or maybe just do Hydra and the Peloponese. Or Hydra and Poros... so many possibilities! Have a great trip!