I did a wonderful island hopping trip through the Outer Hebrides in Molly my previous Plus 4 in 2014. Highlights:
Stopped at Dumfries House on the way up.
Over to Arran and drove around the island (great road) & out the other side to drive round the Mull of Kintyre (amazing drive) - up to the beautifully simple Kilberry Inn
From Oban out to Castlebay on Barra and then several days up through the islands via ferries and causeways (loved Harris as my favourite).
Back from Lewis down to Skye and then cross country to Duns to visit the Jim Clark Museum (my boyhood hero).
Planning a North Coast 500 trip with two chums in Morgans in 2018 or 2019 with me in my ARP4 Morag. Why Morag? The name given to the Nessie like monster said to live in Loch Morar (ARP4 - a fire breathing monster lurking under the surface).
Enjoy - you will have a great time and my experience in Scotland was don't worry about the roads. If you like your golf I would recommend in the Hebrides; Barra (bonkers little course with electric fences and personnel gates around the greens to stop the cattle); pHarris - stunning views; and Askernish on South Uist - one of my favourites ever.
Oddly enough I played with a chap yesterday who was wearing an Askernish sweater! His favourite too !