Anonymous wrote:This is such a great question. I love traveling with my kids, but I also crave the opportunity to do so without them. I would say do a place or trip that is not kid-friendly, as in no kids. Of the places you mention, I'd do Quebec City. We took our kids there a few years ago and while we had a good time, I wouldn't recommend it as a kid trip.
That said, here is what I'd do - make it an adult experience. My recommendation, if you don't mind being with people a little older than you, is a river cruise in Europe (you seem like you're willing to go far). They have plenty of week-long ones, and they are not for kids. You also visit lots of places, so if one really captures you, you might go back with the kids one day. But there will not be kids on the boat and you won't get a feeling of "gee, I wish we would have brought the kids" because the experience/excursions would not have been suitable for them.
Adult only resorts will also offer this, but I think a cruise might be more exciting. River cruises are totally different from ocean cruises. It's all about the places you visit. You could also do a land tour.
I like PP's suggestion of a river cruise, which are mostly adult focused. Plus if you and DH really love a particular place, then you can discuss coming back with the kids later. I love traveling with my kids and showing them new places, but I also really like it when just DH and I go somewhere.
The other piece of this is that the time with your DCs will spend with their grandparents is important as well. It gives them an opportunity to establish a relationship outside of you.