Holidays can be expensive especially if you have a large family, so it is always better to budget to allow yourself time to shop around for the best deal knowing what you have to spend. Although some holidays offer you the opportunity to pay in instalments, most holidays need to be paid in full by six to ten weeks in advance.
The cheapest way to go on a holiday abroad is usually self catering but you will need to by all your food and drink when away, therefore will be required to save money for that too. If you do not want to take much spending money with you then why not try to make your own breakfast and lunch in your hotel room either to eat there or take with you to the beach etc.
Many people spend a lot of money on alcohol, again buying drink to keep in your room will allow you to have one or two before you go out, saving you money. If you are renting a villa, it may be that there is a BBQ on site that you can use. This can be a great way to have a cheap night and still have lots of fun, it can also mean you may be able to put some children to bed and still stay up enjoying your evening.