Itinerary input please

Just a point of clarification, but under Skye, you mention standing stones after Dunvegan Castle; Which standing stones are you referring to? I'm not aware of any there, but I could easily be mistaken...

Just rechecked my information - the stones are on Isle of Lewis which we could take a ferry to from Skye.

Here are a few random suggestions.

Between Inverness and St. Andrews, you can exit the A9 at Dunkeld and head east via Blairgowrie to Glamis Castle, estate of the late Queen Mother's family. We greatly enjoyed the castle tour as well as lunch in the tea shop. Would have liked to walk the gardens but it was pouring rain.

At St. Andrews, if you want to play a round of golf you are aware of the handicap requirement and the lottery system for tee times, yes? Other than actually playing, there's the walking tour of the Old Course, the (excellent) British Golf Museum, and the Ladies' Putting Green aka Himalayas for mini golf. You do not have to have actual golf shoes for any of those, just no high or spike heels.

At Glasgow airport the night before your homebound flight, I'd recommend staying at the Holiday Inn right next to the terminal. The Holiday Inn Express is OK, but not quite as nice.

P.S. here is some information on how to get a tee time at the Old Course at St. Andrews http://www.golf.com/golf-plus/tips-and-tricks-booking-old-course-st-andrews It is complicated, as you'll see.

Glasgow to Oban. A slight detour to the Loch Fyne Oyster Bar is worth it for lunch, IMO.
https://www.lochfyne.com/

Thanks all. Should we make the trip from Glasgow to Glencoe over two days staying one night then driving to Glencoe the next day and spending the night before heading to Skye? Or is it really just a fabulous drive, stopping at a few spots, having lunch along the way and spending the night in Glencoe before heading to Skye but no need to add a second overnight.

Now that you get into it, taking a couple of days to cover Glasgow to Glencoe might be worth it, if you have any interest in Scottish history (and old feuds). Just down the road from Loch Fyne is Inveraray and the Inveraray Castle, home of the Duke of Argyll, head of the Campbell clan. I did not stop, but it is apparently open to visitors. https://www.inveraray-castle.com/
Now your destination of Glencoe is the site of the Glencoe Massacre in late 1600's. Troops under the command of the Duke of Argyll slaughtered 50 or so members of the MacDonald clan who were apparently not quick enough to sign loyalty oaths to the British Crown.
I'll let some Scots fill in the details. It is complicated, but when I stopped at an overlook along Loch Lomond, I chatted with a fellow on a bicycle. He asked where I was headed that day, and I replied that I was going to Inveraray then down the east shore of Loch Fyne to the Isle of Bute and then ferry back to Troon.
"Ach, that's Campbell country! Thems which should be hung!"
I guess he was a MacDonald.

Agree with Sam about Inveraray -- we enjoyed it so much our first time that we planned a second trip the following year to spend more time there. Brambles is great for lodging and daytime meals; the George Hotel for dinner and pub.

Great, I will look to spend a night between Glasgow to Glencoe too!