It is possible to treat kids without breaking the bank & if I recall from previous threads, you're not exacty flush, so do take it easy or you wil be paying for this for ages!!
Your kids are small and they will be kept happy with very simple things - they will love the beach or the pool, so no need for expensive water parks. Stock up at the local supermarket so you can have brekkie & lunch at the apartment rather than restaurants and it will be less stressful. Keep some icepops & water in the freezer/freezer as kids need to keep cool and the pool bar is always about twice the price of the local supermarket - these thing add up!!
If you do go out for a day to a park or trip, be prepared and bring your own things (lunch, suncream, nappies, snacks etc). Extras at these tourist places cost about twice what you'd normally pay.
Give you 5 year some spending money (i give mine about €20) and this is what they use to buy any treats. It gives them an idea of what things cost & they will really want something before they spend their money. This helps to stop the "I want" everywhere you go.
I can't answer your original question as it is different for everyone, but the worst thing you could do it go with an "I'm on holiday, what the hell" attitude and pay it back for months after the tan has faded. You kids will remember the fun they had with you and not that you bought them the over-priced treats. I'm always amazd what my kids remember about holidays, it's rarely so much about a expensive park - more likely to be a frog or crab they found, a friend they met or the €2 euro packet of tattoos they got at the market (after much searching !!)
I reckon it's better to budget and be able to take your kids out again over the summer for small day trips.
Enjoy the holiday!!
150 to 200 euro per day.bring enough to be sure
We've never spent an average of that & there are more than 3 of us.