Some excellent recommendations, but it is vital to plan for fuel in Scotland. A much smaller proportion of Scottish than English airfields have fuel - due presumably to the cost of transporting it to more remote locations.
Which is just a planning issue, albeit an important one. The best little aeroplane flying in the world (at least when the weather is good! ) in my opinion.
I will disagree with Mad Jock on one small point. In Orkney, hire a car. The local bus services will get you there - eventually - but can leave you stranded for hours and occasionally overnight. It's not a good option if you are trying to do things in a relatively limited amount of time. Do visit Skara Brae and the Italian Chapel if you possibly can - places without parallel anywhere else in the world, in my opinion.
G