Having seen some of the worlds amazing sites, Karnak Chichen itza, this rates as high if not higher.
My advice is unless your very very fit take the boat trip around from either Kissimos or Agia Gallini .
We opted for the excursion from Hersonnisos which included the island of Gramvousa leaving very early in the morning, 6am and returning late at night 10pm. The trip cost 34e for the coach and 15e for the return boat trip.
The coach was comfortable and the Rep knew her stuff but constantly talked throughout the trip making it almost impossible to sleep. The majority of the people on our coach were Russian so the priority language was to suit them although the rep spoke both English and Greek.
The coach stopped for 20 minutes after about an 1hr so able to stretch your legs and get a drink.
We arrived at Kissamos at around 10am and boarded the boat, my advice here is don't be polite about seats because no one else will be, grab what you can. Very pleasant trip to Gramvousa our first stop. Plenty of people opted to climb up to the Fort and I understand there is a man with donkeys if you wish to be transported. There is a very reasonable priced Taverna and a great beach. We had about 90 minutes here which is plenty.
We then re-boarded the boat to Balos Lagoon which took about 30 minutes.
The first sight of the Lagoon as the boat slowly glides to a stop at the natural rock reef is awe inspiring, I have seen some spectacular beaches but this is supreme. We had 3 hrs here so were able to both walk up the hill a little to take in the view and swim in the shallow Lagoon.
Sadly there are signs of oil on the beach but this doesn't detract from the beauty of the place.
Then alas it was time to board the boat for the long journey home.
Outstanding day very tiring but well worth the effort.
If your taking young children then the swimming at the Lagoon is great the depth of water in the lagoon part is only knee height but it will be a trek on and off the boat because the approach to the lagoon is very rocky and uneven not pushchair friendly.
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