Where abouts is Garvock?
I'm on a touring holiday next week (a few nights each in Livingston/Oban/Inverness/Dumfries), it looks a nice place to go.
Never heard of it myself, but Googling (and a wee swatch at Google Earth), suggests it's a hill to the east of the A90 Dundee-Aberdeen road opposite the town of Laurencekirk. A nice enough area (except for the myriad of speed cameras), but not on your holiday route, I suspect.
If you're doing Oban to Inverness, can I suggest a side turning to visit Glencoe?
If you go north from Oban towards Ft William on the A828, you'll arrive at it's junction with the A82 at the Ballachulish Bridge.
Instead of following the Ft Bill signs, follow the Glasgow direction on the A82. This will take you up through Glencoe and onto Rannoch Moor in about 15 minutes. Turn at the ski lift or the Kingshouse Hotel at the start of the moor and enjoy the magnificent views on the way back down. Even if it's a filthy day, it's well worth an hour or so to soak up the sights and the somewhat foreboding atmosphere that still seems to linger around there 300 years after The Massacre - Massacre of Glencoe - Wikipedia, the free encyclopedia
If you're really unlucky, you'll spot Jimmy Saville who lives somewhere in the Glen.
If you've got kids with you, it might be fun to see if they can track down the house in Dumfries where, I believe, J M Barrie wrote Peter Pan.
Also from Dumfries, drive to the lovely little village of Gatehouse of Fleet (30 miles) and have a good lunch in The Masonic Arms. Highly recommended.
Hope you enjoy your visit to Old Scotia.
PS - my late auntie used to live in Twickenham (St Margarets)