My wife and I are in San Francisco this coming week from Canada and are taking in 49er game but due to previous plans cannot make Giants games. We were thinking of A's game instead Tues. We are staying in Union Square. How hard is it to get to Oakland for the game. The BART runs close to the stadium I understand but this will be first time on any Subway or Train . Is it walking distance from there? We have never seen a playoff ball game.
Any advice would be appreciated. I would like to buy tickets online before I go Friday or can I find them down there.