Take in a tour of Safeco Field, the Seattle Mariner's ballpark. They take you into the press and owner's boxes, down onto the field and into the dugout, and give you history of the stadium.
On game days after 6pm, they have tours at 10:30 and 12:30. For non-game days, they also have a 2:30. For game days before 6, there are no tours given.