Summer means vacation for the vast majority of Americans. But more and more often, those days off aren't downtime.
Some 61 percent of Americans plan to work during vacation this year, according to a new survey by Harris Interactive. That's up from the 52 percent found in a similar survey last year and 46 percent in 2011.
That's a lot of leisure converted to labor.
(Read more: Most Americans plan to travel for summer vacation)
Are these working vacationers just happy, energetic warriors? Not exactly. A third of the survey respondents who plan to work are not pleased about it, and 4 percent intend to deal with their frustration by throwing something. (Six percent plan to use their vacation to update their résumé.)
People aren't just working while they're on vacation but on weekends, too. The latest AmericanTime Use Survey from the Bureau of Labor Statistics found that a third of the highest-paid workers (those earning $1,291 a week or more) worked an average of 3.6 hours on a Saturday, Sunday or holiday.