Depending on where you live (and how well your team is doing), baseball games are a relatively cheap way to enjoy warm summer evenings. The relaxed pace of baseball makes it a pleasant outing even for nonsports fans. Furthermore, it’s early in the Major League Baseball season, so tickets won't be hard to come by in most cases. To catch a game at Fenway Park, home of the Boston Red Sox, you can get single-game seats for $28 each (or less, if you don’t mind standing).
Or even less, if you don’t mind going late. According to a recent Boston Globe report, the current Red Sox season has been so lousy that the team is literally giving away tickets midgame.
Another cheap option: Hit up a minor league game. The Red Sox’ Triple A feeder team, The Pawtucket Red Sox, offers box seats to their home games for $11, and adult general admission seats for only $7.