Depends upon the length of our drive or the flight time, but I want to leave in the morning -- as early as is reasonable. The sooner we get started, the sooner we arrive and our vacation begins.
My friend and her husband have a disconnect on this topic: She feels as I do -- your vacation arrives once you get to your destination /settle in. Vacation begins once the drive is behind you. Her husband feels that vacation starts when you wake up on travel day -- he wants to get up, make a big pancake breakfast, start the drive leisurely without a lot of concern for what time you'll arrive at the destination.