I don't understand this, if I didn't have to work for >100 days, I'd have a blast! Our summer break starts a bit earlier than most places (end of May) and school starts a bit earlier than many places (middle of August), and we have already visited the pool multiple times, visited family across the country, done some hikes, and done some bike rides. The rest of the summer is busy as well, with visiting the other side of the family next month, celebrating Independence Day (I'm in the US), and doing some camping trips.

If you can't fill 3-ish months of free time, that's on you. I, for one, am going to make sure I and my kids enjoy it.