Hi, I am planning my summer (december) backpacking trip to Greece. I am thinking of staying on only one island as I have limited time. I have narrowed it down to Hydra and Poros. Using this island as my base, I plan to visit Athens and do some hiking/swimming/photography on one of these islands. Any suggestions on which one do I choose? Which greek island has the best beaches, but is not crowded? I'm more of a nature person and not so interested in greece nightlife.