Don't get me wrong, its stunning. We arrived by ferry and the view of the island as you come in is fantastic, around Oia/ Finikia area, houses perched on the cliff, where all of the fantastic photos tend to come from is breathtaking.
We stayed down at the other side of the island down by Akrotiri end and had views over the cliff and up towards Oia. The place was stayed at was an amazing little boutique hotel.
However, behind all that the island is not really that attractive, the rest of the island slopes down towards the beaches on the other side and there isn't that much else going on, a few wineries (some really good whites from Santorini). We walked about 12km from Akrotiri to Ancient Thira which was fairly interesting and then down to Kamari Beach on the other side.
Oia/ Finikia area is just like something you'd find in tenerife or Lanza etc, not bad, but its row after row of over priced crap restaurants and pubs, with a few quad bike hire shops in between. Get stuck there at tourist rush hour and you'll be stuck in traffic for an hour or so.
The airport is shocking, like going back in time 20 years to some of the airports that you used to see on the Greek islands.
All in all its ok and probably better if you're starting your holiday there and heading to other islands from there, but in terms of expectations, it was really a big let down.
If you do end up going there, drop me a PM as there's some really nice restaurants and places to stay, but i'd say you'd get much better on some of the quieter islands.
Best Seafood - Paros...
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Slightly worse for wear after we beat the dingles