If you are going to Crete, Balos Lagoon has to be on your list of places to go.
The sand is almost white and the water is so clear and shallow. There are areas of water that look green and these are where the water is no longer shallow and starts to get deeper.
I was staying in Kokkini Hani (the other side of Heraklion) and to get here was a hell of a journey and cost us 55euros but it really is worth it. The photos you take are simply amazing. I'm quite a fan of "tweeking" my photos so they look that little bit nicer but the area is just so picturesque they didn't need any editing...
I went on the excursion which included Gramvousa Island which before my holiday I knew nothing about but that too was a very pretty area and I would actually reccomend doing both. (there are excursions that go just direct to Balos)
It was busy when we went as the boat that took us had three floors and there had to be at least several hundred people on it. Thankfully Balos is actually very large so the trip isnt ruined by being overcrowded.
If you are travelling a long way like I did, you have to consider the weather. Would you still be happy to go if it was overcast? It took us 4-5 hours to get from our hotel to actually on the beach and it was very tiring. It was very, very windy when we went so the boat was rocky and sunbathing wasn't great unless you enjoy a good exfoliating treatment from the sand blasts.
It really is fantastic though. I'd say it was the highlight of my trip!
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