GO station question!!

I'm going to Rogers Stadium soon and I'm trying to figure out the best way to get there from my hotel. I was thinking of getting a lyft to Downsview station and then walking to the venue from there. The only thing is, I'd need to get from Vitti Street (the entrance) to Downsview Park Trail (one of the exits). Can I pass through the a GO station without actually getting on public transit? It's hard to explain without being able to upload a picture but if someone can help that'd be wonderful!