It will also make it more difficult getting back into the old routine next fall. Even if it's still light out, try to stick within an hour of regular bedtimes. A sudden change can cause everyone to get cranky. Serve regular meals and snacks. Hungry children are not fun to be with.
Hungry parents are even worse.
Without the enforced schedule of school, it's easy to slip into some bad patterns. Watch the clock and make sure there are plenty of healthy snacks available. Try to keep salads, sandwiches, and fresh fruits and vegetables on hand at all times. Hot food isn't as tempting in the summer anyway and hot kitchens are definitely not appealing. Plan some family activities.