Drive up the west coast via Loch Lomond and Glen Coe. Is your wife riding bikes with you? On the way up take the time to ride the West highland way and have your wife drive on. Either ride Rannoch Moor or the Devils stairs case and descent into Kinlochleven. from there stop in Oban or up to Fort William for a night. Continue on to Mallaig and the western Isles to experience some idyllic beaches. This could easily take up you 5 days but if you have some spare then head across country via the great glen and down the A9 stopping at Aviemore and Cairngorms.
In short Scotland could be broken up into Southern scotland, West coast(inc Western Isles), Central scotland (Perth-Inverness), Northern scotland and finally eastern coast.
Each of these areas would take at least a week to see only a fraction of what's on offer.
If you can decide a basic route/area that you are interested in the STW massiv' can really start to help you with specifics.