At the time, Fort Ticonderoga was a total ruin and not yet a park and very far from the meticulously restored set of buildings that it is today; however, it had become a stopping point for interested tourists in the Champlain/Hudson River valley.
The photographer is probably George Creevey. The woman sitting up is Lucy Ellsworth Creevey. I’d have to look in the log for trip to figure out who the other two people are. They were taking a leisurely trip up the Hudson River, through Lake Champlain, the Richelieu River, and up to the Saguenay River in Quebec on their motor yacht, Mavourneen. Classic tourism of the time period.
Acair Fearann 
Date??!!
August 1908 is a rough date, buried somewhere in my computer is the day….