Orkney is well worth a visit, the archeological sites are truly amazing and when you're done with that you can visit Highland Park and sip some world class scotch.
Some stunning scenery too; I was there in April. Can be very very cold/windy though; pack accordingly.
I agree, I’m very fond of Orkney. I’ve been several times on short breaks. Skara Brae is both smaller than you think it should be (studied it in primary school) and more impressive (over 5000 years old). A very peaceful place with great archeology, landscapes and seabirds (got really close to puffins on the last trip) but it is always windy.