I have to say that it just looks different in the summer. We keep up with math, but do more nature/science study, go on field trips, etc. We do more schooling outside, too, on picnic tables. :o)
We just decided which subjects need to continue through the summer and make sure to get those in during the hottest part of the day when we want to be inside, anyway.
We take off of school when relatives visit or there is a cool festival, etc., but it is still considered a school day if we do meaningful things.
HTH,
Mary