On my honeymoon, we started at Edinburgh for a couple of days. We then went up into Invernessshire (sp?) and stayed at a castle that had been made into a B&B. I really recommend that. It can be a little pricey, but getting to live that kind of thing really made the trip memorable. From there, we went down to Rannoch and Perthshire, where the Robertson clan had much of its lands, so we could see the ancestral homeland, as it were.

So what all that means is that I would find ways to make it very personal; visiting areas with some sort of personal connection if you have that option is a really great thing.

As far as more specific areas go, check out Pitlochry in Perthshire. It's a tourism town in the sense that a lot of Europeans and Brits seem to go there for holiday, but it's not overrun with kitchy Gold Bros. type of stuff. There's lots of good out-doors options, like hikes and the like. They've got highland nights (one was on the grounds of Blair castle!) that feature cool local performers (the local pipe band even played "Highland Cathedral", which was what the piper played for the recessional at our wedding in the states).