It can work out expensive to go away during the school holidays so we look out for the best deals. We often choose the last week of August to pop across the channel for a break as you can get breaks cheaper due to the French/Belgian/Dutch children being back at school. There are no problems driving through Calais so long as you drive in the daytime.
Venue holidays are like Eurocamp but better value so we often book a few a break to Berny Riviere at least once a year. Normally we go either Easter holidays or last week of summer holidays. Loads for children to do and a lovely little man-made beach. It is also a good base for a trip to Disney. This usually costs us around £200 or just over for 4 of us to have a 3 or 4 night break in a static home.
We are just back from Center Parcs in Belgium (De Vossemeren) which was under half the price of the uk price for the same 4 nights. It was amazing - there was so much for children to do, far more free things than Elveden. Also much quieter due to Belgian children being back at school so no queues for slides etc. Drinks and activities were also much cheaper than uk Center Parks. 4 night break at the end of August in a VIP lodge cost us just £399 for a family of 4!
We also had a week in the Alps as my DH's parents have a house out there. Probably spent over £2,000 on travel, lift passes and ski hire.
Week in Sorrento, just the two of us for our anniversary. Bit of a treat and cost around £3,000 for the week.
Tenerife for 10 days all inclusive in Oct half term cost just under £3,000 for 3 of us as DS1 doesn't want to join us. Got this slightly cheaper as DS2's school have development days the week before half term.