Camden is still on my list to see. My dad and I have been to 14, I think...my favorite by far is AT&T Park in San Francisco. Gorgeous!
I toured AT&T Park (Giants were in Colorado when I was visiting SF). It is a beautiful park. They did a fantastic job with that one.
PNC in Pittsburgh is awesome too. The inside of the park doesn't quite match AT&T or Comerica, IMO. But, the all-around experience with PNC makes it great. Walking across the Clemente bridge to go to the game, having bars in the stadium that open to the outside perimeter of the park, the river and river walk right below the stadium (with a canoe livery right there) ... it's a great experience.