AT&T Park (home of the San Francisco Giants):
Superb sightlines from just about every seat, comfortable seating everywhere, superb concessions, modern luxury boxes, really decent restrooms, excellent press facilities, excellent access to public transportation and even the visitors' clubhouse is way better than the home clubhouses at Fenway Park and Wrigley Field!
Small wonder why it's considered by many one of the best MLB ballparks in the country, period.
Ever been to PNC Park in Pittsburgh? Fantastic baseball venue, perpetually terrible team.
It is really cool. We used to ride our bikes up to it, and view the game for free!