Had stumbled upon the ranger cabins that Algonquin Park rents out during the season, but after doing some research, found that they're booked solid for the summer (and from what I'm told you have to book the day that they're available they're that popular). So was wondering if anyone knew of anything similar in the area that existed at all? The only options i found through the parks are at least a few hours (if not more) drive from Algonquin, which had a lot of the items that we wanted to check out.
I own Red Deer Log Cabins, in Madawaska. The location is about a 20 minute drive from the east gate on highway 60. On a quiet sideroad, and a beautiful west facing waterfront with a sand beach, my place is often used as an affordable base camp for those wanting to spend time in Algonquin Park. Please check my site. You can find reviews on TripAdvisor.
I don't know what map you used, Karlson, but it is much closer than 50 km to the east gate on hwy 60 from here. I think it is 28 km, and takes about 20 minutes to reach the east gate driving at the speed limit of 80 km/hour.
Camping is always an option and is easy enough, but it may not be what you consider "similar" to roofed accommodation.
Other than the ranger cabins your other option appears to be one of the three lodges in the park:
All three are inside the park, just off Highway 60.
Other than that, Tripadvisor has a number of external accommodation options within 20 or so miles of the park boundaries.