My trepidation aside, spring break was a lot of fun this year, a nice mix of activity and relaxation. I think it helps that the kids are getting older (or at least Claire is getting older and I don't have to drag a stroller and diaper bag everywhere or squeeze everything into the window between naps.
During school, the week is governed by each child's weekly chore chart and homework chart. In honor of spring break, I let them choose their own chores (shredding papers in the office is the most coveted). Here's our current chore system. Normally I choose the chores that need to be done each week (about half are permanent and half rotate). We try for one job a day, with Saturday for whatever's left. Of course, this is on top of their normal daily life jobs like putting laundry away, making beds, setting/clearing the table, etc.
I also came up with the "Spring Break Bingo" chart to encourage them to keep their brains going in ways that didn't require me to help or supervise.
Getting "bingo" earned them wii time. They outsmarted me though, and after the first day, kept using squares they already finished to earn future bingos. So by Friday, they only had to do one or two things! Oh well. At least they were doing something, and the motivation meant that they tackled all their stuff first thing in the morning. Next time I'll make the chart 6 by 6 squares to allow for them double-counting things!