If you are going into the countryside, bug repellant (penethrin based) and barrier nets (mozzie head net. The midges have to be seen to be believed. I was rock climbing just outside of Fort William in July. Had hiking trousers on, bloused onto boots for the approach. Stopped for a break. Looked down and the bottom of my trousers where green with midges.

The Scot's like Americans so you should have a good time.

There is also a very good whiskey shop in Fort William. Try the Loch Dhu (Black Whiskey.) Forget the Laphrag. Tastes like cats pi........