We go away at least once a year without the children. At first it was just a weekend, this year we managed ten days. The boys are only 3 and 4 now, and we leave them with grandparents. If I had the money, I would certainly leave them for three weeks to go on a 'wow' holiday, such as New Zealand.
From this thread you're all horrified by this. So why do we do it?
We desperately need this time for us, to build up our relationship as a couple, and to put ourselves first. I am a SAHM and often feel that in most day-to-day decisions I put my needs last in any equation. The boys come first, second, and third. I love being home with them, but sometimes I just need a break. We just got back from a family holiday, which was very hard work. There were some good parts, and some special memories, but I didn't feel it was a holiday for me. With the boys we can't do the sort of things we would choose to do for ourselves. (Lots of bleakness, solitude, quiet reading, long walks). I don't think it is "fair" to drag children along with things they don't appreciate.
The boys will now walk up to 4 or 5 miles, and do appreciate wildlife, nature, birds, etc. I loved taking them to a beautiful remote cove in Cornwall, and watching the basking sharks, seals, and dolphins ... but they also have other ideas of fun. Of course I enjoy sharing their enjoyment in things, but I like to have the freedom to make my own choices too sometimes.