you can get a pardon for DUI's, to gain access to canada, I have known several; people that have, including one of our Presidents LOL
http://www.pardoncanada.com/
as for if hunting violations, I think I would contact a border crossing agent and ask that, as a game warden may or may not know, and if you get wrong info, and get caught IN canada when you shouldn;t have been, you might not be able to leave< as you would have broken there laws and be a criminal there? which could end you in jail there/
I had a friend that got INTO canada NO issue's but on return he couldn't get back into USA,
ended up staying and hiring a lawyer and a lot of cash to resolve things,
as they better to ask before than find out after!