My Favourites (as a sort of English Scottish expat regular visitor)
East coast
Icecream on the beach at St. Andrews
Picnic at Dunotter castle and a wander around Stonehaven
Dolphin watching at Chanonry Point and dinner at The Anderson, Fortrose
Potter about Cromarty and the Nigg ferry, pictish stones at Nigg Church
Middle
Carbisdale Castle, the poshest Youth hostel ever
Bit touristy, but ospreys at Loch Garten RSPB reserve
West coast
Otter watching on Mull
Iona and boat trip to Staffa
Camp on the beach at Morar, just south of Mallaig
Dinner at the Kilberry Inn, Kintyre Penninsula
Oban, then a Calmac ferry to anywhere (Calmac macaroni cheese and chips)
Outer Hebrides would have a whole list of its own
Sticky toffee pudding at the Uig Hotel on Skye
Do your own rock arrangement at Neist Point, Skye, (watch for whales)
Check the Visit Scotland website for food/music/highland games and festivals.
Undiscovered Scotland website for more details on good stuff to do and accommodation lists.
Have a good holiday,
PG
oh, and get the lass on a bike....I hear tandems are good