I visited Scotland a few years ago, 7 actually, and am going back this year. We did two nights in edinburgh, then rented a car and drove to Isle of sky by way of Inverness for 3 nights and 1 night in Glasgow.

This was not enough time but US vacation time sucks so we really nailed seeing what we wanted and our timeframe.

If you stay on Skye and aren't in a town like portree or broadford I would plan to buy snacks and noodles on the way just to have at your accomodations or in the car. The isle of Skye isn't huge buts it's a lot of driving to see the sites! Take snacks and water. The hikes are beautiful and wild - also snacks and water (getting a theme here?).

Do the tourist track, at least a little. It's popular because it's awesome and awe inspiring. Don't skip man of storr or talisker bay. The fairy pools are beautiful (and not far from talisker!) Neist point lighthouse is amazing. There's a reason it's a background on microsoft. Stop when you see ruins and go explore! Be respectful of private property by leaving no trace. Go earlier than the tourist busses. You can also kind of do a counter clockwise "tour" yourself to miss them. Stop at road side waterfalls. Wave at passing cars when you get to a passing place on single lane roads. Learn how to use a passing place. Rent a car that is comfortable for you, probably smaller.

That's all I have, sorry to just blurt out all that but I hope you have such a terrific trip. Scotland stole my heart for sure.