I don’t remember too much from my trip to Santorin except the rapid ferry that made me puke, the road from the port up to town that scared me, and of course the postcard view from Oia Sunset. Yes it worth having a trip to Santorin only for it and for the villages up the cliff overlooking the sinking volcano.
But for this experience you need a high budget. So for simple travelers like myself Kamari beach is a good option and especially that I found there, at the end of the beach to the cliffs a great little terrace, family run. Great beer and sandwiches. And of course ice coffee.
Another tip is to have an accommodation nearby, don’t rent a car and come at the begging or the end of the summer season to enjoy the beach almost for yourself, no sun beds.