My wife has a conference in San Francisco in early April and my 3 month old daughter and I are going to go with.  It will be our first trip to the Bay Area - we live in North Dakota.  We think we will be able to catch the A's game on April 3rd - I'm a life-long A's fan.  Because it'll be our first time in the Bay Area, and won't have a car, I have some questions...

1. What's the safest way to get from Fisherman's Warf, where our hotel is, to the ballpark?
2. What's the most efficient and cost effective way of doing it?
3. What would you recommend for people who don't know the area and have a 3 month old with?

Any info you could get us would be great.  Thanks!