Make room for the story as well as the plan
A paper notebook, photo album or travel app can each help you remember a trip. Choose a method that feels easy enough to use while you are away.
Linking an entry to the place, date and itinerary can help preserve context that a standalone photo may miss.
A trip journal app fixes the structure problem only if it knows about the trip. That is the idea behind Sorom journals. Each entry can link to the itinerary you followed, so the day you write about is already there: the place, the date, and the plan.