Perissa is yet another sea-side village (or rather: tourist waterhole). It has a long black sand, which is great to look and hot to lie on. There are all the usual water based activities plus a regular water taxi to take you round the headland to the neighboring town of Kamari.
It is on the summit of the mountain between Perissa and Kamari. Here is a 3,000 year old ancient Greek town, which is still being excavated. Many of the relics in Athens were pulled up from here. The tour guides do not push this, because there are no organised trips there. Please beware, this is not for those who have mobility problems.
There is a 3KM hike, up a 600M hill. then you have to walk round the ruins. Note that (as of this writing), Ancient Thira closes at 2:30pm, so this is better as a morning or early afternoon trip
Even in the evening, it is worthwhile for the views of Kamari and Perissa. From the summit, there are paths to Perissa, Kamari, or up to the monastery (from where it is possible to walk down to Pyrgos).
It was a treat to my spirit! Could I have been happier?