Where do you want to travel... lowland Scotland.. central Scotland.... western highland route... eastern highland route..
what do you want to see & do.
I recommend you visit the beautiful Argyll and a couple of Isles in West Scotland. There is a car ferry in Gourock near Glasgow that would transport you to Cowal penninsula in 15 minutes. The drive then is super scenic (at times simply breathtaking) and the roads are excellent.
Benmore Botanic Gardens and Argyll Forest, Loch Lomond and The National Park, Inveraray Castle and Jail, Oban are just a few places to suggest from the top of my head that are amazingly beautiful and do Scotland proud.. Depending on your interests, there are whisky distilleries, seafood places, boat tours and cruises, outdoor adventure stuff. Let me know if you'd like more info.