As above, Edinburgh is worth a look, lots of scenic routes to get there too. Some nice stuff in dumfries and galloway, but more so in the highlands. If you want a list of scenic fun driving roads, let me know! It will take longer to get places on them, but there is loads of quiet twisty roads, you can pick and choose!
Some of the islands are a trip on their own, you can drive on to Skye on the west coast, nice things on that route.