There's a field called DMZ Paintball in the Niagara area (Thorold, to be exact) that has public walk ons. They're open year round but only do airsoft on select days. Mondays in the summer, Sundays in the winter. It's a decent field and usually has around 15-20 players no matter when you go.
Last edited by Shamusodoofus; October 24th, 2014 at 16:29..