Hereafter, I write '30,000 islands' to mean the many islands that compose the Georgian Bay shoreline: from Bayfield Inlet, to Killbear Provincial Park (west of Parry Sound), down to Midland, ON.
The travel guide Moon: Geogian Bay and Cottage Country reveals White Squall Paddling Centre, but which is irrelvant in my uncle's case because his car cannot transport any watercraft:
Our lake is landlocked, you must transport rentals using racks and/or pads & strong ropes (or arrange a shuttle).
My uncle lacks boating skill or license; so for safety, he intends to rent only a paddle boat or simple rowboat. Please see the context herehere if necessary.