Besides Portage and Opeongo Stores, where can a layperson rent watercraft in Algonquin Park?

On 2015 October 20, for three nights (and 4 days), my uncle will drive to see autumn foliage in Algonquin Park with my grandparents, but will lodge in Huntsville, Ontario. Important assumptions:

1. Google revealed to them The Portage Store (on Canoe Lake) and Algonquin Outfitters' Opeongo branch, but these have already closed.
2. My uncle's small car cannot transport any watercraft.

3. My grandparents' debilities (as described here) mean that my uncle will be performing all physical work, such as all driving and boating.

4. Though they can all swim and vow to wear life-jackets, they lack any boating experience or license and so will avoid canoes or kayaks which can endanger amateurs. Instead, they plan to rent paddle boats or simple rowboats, which (they trust) are safer?

5. They intend to spend three days exploring on water, but they desire to explore a new part of the park each day. So do they only need to vary the access points? Is there a map listing all access points that offer rentals?