The school holidays can be expensive, especially if you've a number of kids - what are your ideas for the days you don't spend a cent? Do you stay home or do you head out to the shops or libraries and check out the activites they put on?
I check out what the local malls have on offer. Some of it is really good entertainment. We have one mall in particular which gets some big name kid acts and puts on a really good production.
Although the entertainment is free, don't be fooled into thinking it will be a free day. Somebody will inevitably get hungry. Or thirsty. Or both. Then you'll notice there is something you'd been meaning to buy on special. There goes the free day.