Well it's a stunning place, so very very beautiful.
There's not that much to do, but if you're all outdoorsy types you'll be fine. You'll need a car to make the most of your stay.
There's the main sandy beach at Calgary, not that far from where those cottages are, a short ish drive. And I've never seen it busy.
But the really spectacular scenery is right down south of the Island on the Ross of Mull. Gorgeous mountains and lochs and little hidden sandy beaches.