I was thinking of driving up the west coast and across to Inverness, then maybe coming back through the Cairngorms. I can only really take a week off in summer though, which I realise isn't a great deal of time. My main questions would be where I try and see in that time, and where it is worth stopping along the way for a night or two? Cheers.
The break we planned last October was just under a week and that included stopping over in Glasgow for night to break the journey and pick up my son who was flying up to Glasgow to join us and 2 nights in Edinburgh that we could easily have trimmed to one.
Calmac ferries are very customer centric but I would recommend booking specific ferries as lot of the shorter routes do have a lot of "rock ups".
My suggestion given the timings you are talking about could be head to Oban (as already mentioned above - beautiful town and great for food and drink
). Then go over to Mull for a couple of days on the Craignure ferry. Tobermory is delightful and it is a great drive around the island, including popping over to Iona which is well worth a visit. The Abbey is quite a treat and also ex-Labour Party Leader John Smith is buried there if that is your thing (it is mine). You are guaranteed so see seals and the like and if lucky Golden Eagles. Also Calgary beach is probably the best beach in Britain!
From there you can head back to Mainland and up to Fort William (via the Fishnish/Lochaline ferry) for Glencoe, Loch Ness, Ben Nevis, Spean Bridge and more.
After that depends upon how much time you have left/how you want to use it. It's an easy drive to Inverness from Fort William along the banks of Loch Ness for instance, or as I said previously the drive to Skye from Fort William is amazing and the bridge means no ferries to worry about.
Honestly, you cant go wrong up there - plan your route, book accommodation/ferrries as needed and you are laughing.
I did this route (without Inverness) last January in 5 days and it was amazing, even in depths of Winter.
HTH as young people say. Happy to add anything if you need more advice/help
EDIT*** Channeling my Inner Bamboo with the length this post (no offence intended Bamboo
- last time I wrote this much was for my thesis!!!!!!)