There's no way those big boats could get this close to shore as they draw too much water. The marina would also be too crowded with small craft to allow a tour boat to squeeze right up to the Confederation Park waterfront.

The departure point for tour boats is Crawford Wharf, 1 Brock St. It's a long dock projecting itself out into the river; odds are it originally was a coal dock (Crawford Fuels was originally one of the three main coal dealers before everything went to oil and later natural gas). The Wolfe Islander II and Upper Canada ferries to Wolfe Island docked at the foot of Brock Street until 1976, when the inception of Wolfe Islander III required the dock move to Barrack & Ontario St (the new boat required that the ramp be built onto the  dock, not the ship). Now the tour boats (Island Queen, Island Star, Island Belle) load at the wharf at the foot of Brock Street.

Crawford Wharf probably should be marked, if not for the tour boats, then for the temporary Water Taxi service that same company (Kingston Destination Group) is running temporarily from that wharf to the HMCS Cataraqui dock in Barriefield now that the Lasalle Causeway has been destroyed. No idea how long that will be active.