What Shall We Do About Summer?

My family is going through our annual "what are we going to do about summer?" decision-making process, trying to make plans for our kids to go to the U.S. Figuring out what to do with kids during summer vacation is a challenge for any parent, I'm sure, but in our case it's extra difficult due to various cultural and scheduling differences between Japan and America. First of all, summer vacation is very short in Japan, being only six weeks long, so the time we have to work with is quite limited. We like to find activities for our kids that will help them maintain their English skills, like Girl Scout Camp for my daughter and various science-related camps for my son, but choosing the right program is never easy. While I think summer should be a time for kids to relax and have new experiences at a leisurely pace, my wife always goes into kyoiku mama ("education mother") mode, insisting that anything we choose for the kids to do have serious academic value. While the idea of doing homework over the summer break is totally alien to American children, kids in Japan aren't so lucky. In addition to everything else, we've got to factor in about 20-30 hours for the mountain of homework my kids will have to work through before school starts in September.