well, some places you MUST see......!!
From Glasgow, head up past Loch lomond (you can tak the high road or the low road!!) on route to Oban, you can stay in Oban and ge the ferry for a few days out to the islands.
Oban up to fortwilliam - go via Glencoe, site of the famous massacre. Some nice simple walks in Glencoe, but it's a very haunting place
Avoid Fort William - once described as the ugliest town in the most beautiful countryside - but that person hadn't been to Dundee!! LOL
Head up Loch ness, see the monster, buy tourist tat!! Go to Fort Augustus, lovely auld castle right on the waters edge.
Over to Skye - on the way over you can go see Eilean Donan castle, then over the bridge to Skye (not quite over the sea to skye anymore as they built a bridge!!)
Some great drives/scenery around Applecross too
Along to Inverness, take in Glen Affric nr beauly, Culloden, even the town of Inverness which is quite nice now
Then up to Culloden - which is the most amazing/haunting/saddening place all at once, not far from there is the Clava Cairns, which are really cool. You can also go to Fort George at Ardersier - built by Wade to help keep unruly Jacobites in their place after the 45 rising was quashed
then south from Elgin along the whisky trail to Royal Deeside, across to blair athol/pitlochry/killiecrankie and into Perth and Fife.
that should give you plenty to see and all the history you an shake a stick at!
enjoy!