Given the northern location of these islands, the sun sets at about 11 pm and it never actually goes dark.
We visited the Island of Hoy on Friday. The most famous landmark is the Old Man of Hoy, but seeing it involves a very long walk, so whilst my friends were doing that, I spent a long time in Rackwick Bay. I came across this bothy (old cottage) on my way to the bay:
We visited the Ring of Brodgar, an amazing ring of standing stones on Mainland Orkney:
And visited the Brough of Birsay in the north of Mainland Orkney. Unfortunately we arrived at the wrong time of day to visit the island you can see in the background. There is a little causeway footpath, but the tide was rising and we had to go back after only a few minutes: