I am a helicopter pilot, but all my flying up that way was done during a week's flying holiday, in a C150. However....
You can fly up to Inverness following a spectacular steep-sided valley north of the Great Glen (sorry, don't have Scottish map to hand to check names and details), refuel at Inverness, and fly back along the Great Glen.
Nip over to the Outer Hebrides, land on the beach at Barra, go back via Skye and Oban (for fuel).
Have a great time; it's a lovely area for flying.