A few questions:
Did you have a boat on the lake or access to one during that visit? If not, that would eliminate all but the bridged islands, if it was indeed on an island.
The pictures look like you were at that cottage for a longer period than just to check out a potential rental. The family looks "settled in".
If everyone in the pictures is a family member where are the owners who would be showing you the place to see if you would like to rent it?
The picture of the Mount Washington has a marker and it looks like a rock is next to it. You could look at a chart and follow the Mount Washington route looking for a similar marker and rock on the route.
The fact that it is on the Mount Washington route should eliminate a lot of places it couldn't be.
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