the north west coast, including the Isle of Skye is just spectacular. You can really have a good explore around here if you've got a car, but there's still good options for trains/buses etc. It's a wild and remote place and the weather changeable, so pack some wet weather gear - we had rain on and off but I think it added to the experience as the light and landscape looked different every few hours! (oh, take a good camera too!) about 6 years ago
Edinburgh is a great city, as is Glasgow.
The Highlands are stunning - a drive through Glencoe, up over Rannoch and then heading to Glenfinnan or out onto the Ardnamurchan Peninsula is pretty hard to beat to be honest.
I loved Islay - the distilleries are amazing, I adore Mull, Rothesay, and Skye. about 6 years ago
We stayed on Loch Ness (rented a house) and drove around - Inverness has a lot to offer, Culloden (LOVE IT!), Cawdor castle, Clava Cairns, watching dolphins at Chanonry Point. Definitely drive around Glen Affric. Follow the Caledonian Canal. We loved Glencoe - and Mallaig. The Islands (Skye, Eigg, etc.) are incredible. One great website is TravelingSavage.com - beautiful photos, great advice, focused a lot on whisky ;)
There are so many great places - 2 weeks is short!! almost 6 years ago