Write a list of days and weeks. Put in something fun every other day (ish, more or less depending on age of child) This give you time to do house stuff but also plenty to keep occupied. They always ask 'what are we doing, where can ewe go, or I'm bored' etc and you can answer with 'well tomorrow we are......'. They have enough downtime as well and they dont have to be anything expensive. Picnic in the park, (even in the rain!), geocache, visit new playcentre (obvs. for littlies only!), visit museum, trip to....wherever, if they are young and you usually travel by car, take a trip into town on the bus, just because kids love soemthing different, maybe an icecream once you are in town. If they are older, use the next couple of weeks to get bits and bobs for science experiments, trawl charity shops for board games for rainy days, or get insupplies of big boxes so they can make a castle, car, whatever.
I love school holidays as you can totally chill out about the housework, routine etc and you get time to do all those things you cant after school as there is no time or activites take up what time there is and we are too busy working or doing housework on the weekends.
~Holidays are what you make them. Most importantly, HAVE FUN! :)