We just returned from Greece, where we spent 3 nights in Oia, Santorini. I cannot encourage you enough to go see the Art Space gallery which is actually on of the oldest wineries on Santorini which still makes wines according to long held standards. What is unique is that two of the caverns have been converted into art gallery displays. When we walked in and our guide, the owner and son of the original winery founder, turned on the lights my jaw dropped - it was so unexpectedly beautiful. He then offers to show you "his art," the wine. For 5eu he gives you a tasting. We were lucky to get there when hardly anyone else was around, on a Friday. He said on Saturday they would be crowded. The second place that is a must see is Ancient Akrotiri. We had just come from Athens and after seeing the Acropolis my expectations for seeing more ruins were low, however they have done a remarkable job with this site. We also visited Fira and it was a little off-putting with traffic/crowded streets, but once we got out and wandered the shops it was enjoyable. We ate at Ouzeri, which you have to walk up some steps to see, and really liked it. Most of our info came from Lonely Planet's Greek Islands book, since we only had Rick Steve's Athens and the Peloponnese book. The manager of the villa we stayed at recommended taking a 5 hour boat tour to Thirasia Island and it's hot springs but we didn't have time. I agree with walking down to the Bay of Ammoudi but be aware that you cannot actually see the sunset from the restaurants, at least not the sun actually setting into the water. Also, we got down there at 6:30 (sunset was at 8:30), and all the harbor side tables at all of the restaurants were reserved. We ate and then walked around to a rocky edge where we could see the entire sunset and the lighting from there was spectacular. The walk back up is daunting but they have donkeys if you want a ride!