Ron
If you are going to drive to Cruden from Dornoch, I would suggest that it’s not done in a single fast track way. Take the day off and if you have not been in the North of Scotland before take the opportunity to call in and check out some of the courses on the way down
I would travel from Inverness to Nairn, Lossiemouth/Elgin Buckie, Cullen, Fraserburgh, Peterhead the Cruden.
The return would be via Aberdeen on the A96 to Huntly, Keith, then A95 to Aberlour down to Boat of Garten, then back up the A9 to Inverness.
Select your course first and subject to time call in to as many as possible.
One course you must check out if not the town is Strathpeffer Spa, near Dingwall about an hours drive south of Tain/Dornoch.
You may then enjoy the drive- which is about 170-180 miles if you follow the coast road.
Good luck
Melvyn