The bleachers are a group of sections in right field below the main scoreboard and next to the out-of-town scoreboard. If you're a fan who likes to keep an eye on the videoboards, you might want to avoid these sections.
Multiple men's and women's restrooms are well-positioned behind the bleachers, though you'll want to sit close to Section 98 to be close to beer and concessions. For a better view of the game, try Section 90 or 92. These sections are a rarity in baseball stadiums -- outfield seats with a view from center field. Home runs aren't uncommon in most rows of 90 and 92, but you'll want to sit in the first three rows of the other bleacher sections for a shot at a ball.
It's worth noting that bleacher seats at Oriole Park do have chairbacks - they are not benches like in most. However, as with the bleachers at most ballparks, these seats do see a tremendous amount of sun.