The museum of prehistoric Thera is also worth a visit if you make it there! It is fairly small but contains some incredibly well-preserved artifacts. The frescoes are stunning.
I found Fira (nearby "large" town on Santorini, very close to the sites) miserably crowded, but seeing Thera was very cool. This is all about 1500 years older than Pompeii, so a very different experience IMO.
Minoan fresco is so unique. They were truly a civilization unto themselves. I wonder how much they had in common with the rest of "Old Europe" (pre-Indo European farmers)
I found Fira (nearby "large" town on Santorini, very close to the sites) miserably crowded, but seeing Thera was very cool. This is all about 1500 years older than Pompeii, so a very different experience IMO.