Hi,
To add to the other answers, here’s the link to Quebec’s National Parks website:
https://www.sepaq.com/
There are parks all over, so you’ll definitely find something to satisfy your hiking cravings!! In Charlevoix, Parc des Hautes-Gorges is quite famous, especially for its renowned trail ''L'Acropole des Draveurs'' (which is totally worth it, especially for the stunning view at the top!)
Good luck with your planning!
Just a heads-up—if you're going at the end of October, it can get cold (at night, obviously, but also during the day, especially at ''altitude''!)