Its your vacation, so tell your
story. Everyone has seen scenic photos of the St. Louis Arch, Old Faithful, and other major landmarks, so while you should feel free to go ahead and take those picturesque shots, make sure you get a couple that have your own twist to it.
Through two main focal points, you can see that the subject is on a canoe and heading to Boston, telling the story of that day's activity.
Aside from the standard group shot, take photos that prove that you were there; a photo behind the group as they climb a mountain, that moment of frustration while waiting in line, or perhaps someone merely attempting to pack an already full car.
Capture the best and worst of your journey either way, you'll be laughing about it later. Here, you can see the distress by the subjects gestures, while also telling the location, after she was in a car accident.
Photos that literally say where you are, through signage or landmarks immediately have impact. Ultimately you want to capture slices of life that span over the entire trip, building a visual narrative that tells a story so well that it could go with little or no explanation.
Sometimes, such as this frame, you can literally show the viewer where the subject is.