Yankee Stadium 3 or 4 times
Camden Yards- a great ballpark; a bunch of times
Camden is sweet. My company my dad works for has a suite there with a view straight down the first base line. It's amazing...big plasma screen, crab cakes, A/C, outdoor seating and indoor seating, crab cakes...
I was there earlier this year for two games vs. the Yanks, one the Yanks lost (dammit) and the other got rained out, but the rainout was bearable because we got to watch some other games on the plasma screen while eating lots of crab cakes. We hung out there for about 30 min after the game finally got called.
And I hate Shea, just for the record.
Go RF bleachers at Yankee Stadium