I tend to eat a lot more processed, prepackaged,restaurant, or otherwise not-homemade food while vacationing. A lot of it is pactical aspects; the chest freezer won't exactly fit in the car, and time and spoons spent preparing meals are ones not used for 'vacation' things.

That said, if we're staying with friends, there's usually at least one meal that we borrow their kitchen for. It's all about usage of available amenities.