Algonquin Park is huge, and much of it is accessible only by hiking or canoe. As well, even to get to the "east gate" entrance of the park, you are looking at a drive of several hours return. The "main gate" near Huntsville is an even longer drive. Why did you pick Algonquin as a place to see? Tell us more.
If you want to see maple trees in the fall, you can go to Gatineau Park, a few minutes from downtown. You'll see maple groves to equal those anywhere. To get there, you can rent a car and drive yourself, stopping at the many lookouts and parking areas that offer hiking trails through the forest. If you're fit and energetic, you can even do it by rented bicycle, but it is very hilly. Or there are probably short bus tours available in the leaf season - you can research that on the main TA pages.
I just don't understand why you want to go to Algonquin Park to see maples, unless you have another reason for going there.
Many people go to Algonquin Park to see the fall colours. Presumably the OP would be hiking and sightseeing and not just glimpsing the trees on a drive-through.
The size of Algonquin's backcountry notwithstanding, the relevant part of it for a frontcountry visit like this is the Highway 60 corridor, which is 60 km long through the west-central part of the park and is where most of the day hiking trails and other visitor facilities are located. The two ends of the corridor are the East Gate, located at Whitney about 2:45 drive from Ottawa, and the West Gate, near Oxtongue Lake, about 45 minutes west of there (Huntsville is yet another half hour west and you wouldn't go there). I don't know where you get that the West Gate is the "main gate".
Everything is very well-signed and there is no reason for a guide if you can drive yourself.
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