I would definatley say Poros as Hydra is a little to far and hasn't got the beaches as easily accessible as Poros. Get off the boat and then get a short 3 min taxi ride to Love Bay
For beach activities you may be better off going to Aegina or Agistri, both of which are closer to Piraeus which is where the ferries depart from.
Poros is perfect for a one day trip. It's a pretty little island, with lots of trees (rare thing for Greek Islands), and the beaches are easily accessible. Hydra is more pictoresque but to reach the beaches you have to take a sea-taxi.
I say go to Poros.
I would say poros, never been but I am going in july for a week, plus its not to far on the ferries from Athens, and the beaches look lovely ! but I am also staying in spetes for a week as well and I plan to go to hydra cause its meant to be lovely !Edited: 20 June 2013, 10:51
Poros is better but you need to find a bus/taxi to reach a beach (see reviews) from the ferry port. Hydra is over-rated and the local beaches are small and rocky unless you take a water-taxi. 'Love Bay' (invented name to catch the tourists) is small and sandy, 6.5 euros for 2 sun-loungers, table and umbrella, bar prices reasonable (except 2 euros for small Coke!). Beach is too small for volley-ball, etc.so just swimming or (need to check on this) perhaps time for an introduction course to Scuba diving which runs from the bay.Edited: 02 July 2013, 11:28
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