The island site that you've circled won't get the best sunsets. It is relatively close to the abrupt hills on the westward shore. This means that the hills will block the setting sun earlier to this site than it will to the sites located further east.
Here's the sunset view from the other island's northmost of four sites. It's slightly abbreviated by the opposite point ...
Here'a an old shot of that campsite. I believe Barbara was there in 2007.
There's a cliff to the north of that site, ascendable by a slightly difficult access directly from the campsite ...
Here's the sunset view from the same vantage point. The island you're considering is directly below the setting sun.
The entire triplog (2000) is at ...
http://www.algonquinadventures.com/photos/shows/show6/index.htm
If your parents are still capable of slightly difficult ascending hikes, this could be attractive to them. If not, don't tempt them. Your call.
Barry Bridgeford
http://www.AlgonquinAdventures.com
http://www.ABRweb.ca .. Algonquin Backcountry Recreationalists - Caring for Algonquin's Backcountry