Not an issue to be honest - not long left of the holidays, and they've already been away, so don't feel like they've missed out. Plenty of people grew up having a couple days out in the school hols, and spending the rest of time just playing out and watching TV and have plenty of lovely memories!
If you're looking for stuff to do for free for the next couple of days, send the kids on a scavenger hunt round the house for the following:
- a board or card game they want to play
- some unused craft stuff
- three bits from the recycling they think they can use for a 'challenge' later on
- something they haven't played with for a while and want to give away
- supplies for a pamper night (if you have that sorta stuff)
Then sort some 'indoor activities' - a craft challenge with their recycling bits (build a rocket/ build a marble run/ house for their teddy), a pamper night, a games afternoon, find some nice drawing or painting tutorials on YouTube and put it on the TV, some baking if you've got the ingredients in. If it's be a change from the norm, a day where you let them play video games all day (with you if possible) may also be fun,
And outdoor activities - print a map of the local area and get them to plan a long walk (if you fancy, you can turn it into a 'survey' of local chippies/ice cream shops etc - get one small portion to share in each place and sample and rate from each place), a picnic and visit to the best local park, scavenger hunts (rural if you've got woods locally, if not colour/ alphabet can also work), visit the local library and an afternoon/evening all cozy and reading together, if you've got bikes could do a long bike ride one day. If there are other families you're friendly with who also have kids, get them involved if you can, kids are usually happier when there's more of them to play!