Naturally, I would like to recommend you visit the Kingdom of Fife, home of golf and countless quaint fishing villages along the East Neuk. Visit Scotland has loads of good ideas of what to see and do in Fife.
Visit Scotland Website for Fife Region
I also love Perth and Kinross-shire, especially around Dunkeld (The Hermitage), Pitlochry and Aberfeldy with Loch Tay and Rannoch. The Angus Glens also make for great days out driving and walking.
As other members have already said, a Charge Place Scotland card will come in handy. Whatever you decide, I’m sure you’ll have a braw time!