A travel writer.
An astronaut.
The person who signs documents is typically referred to as a signatory or a signer.
Motorist
passenger
a cyclist
Travel advisor
Astronaut
A teenager
A person who travels around the world is often called a "globetrotter" or a "world traveler."
i think the answer is "pilgrim"
inspector
If their purpose is to preserve the documents for future reference, they would be called an archivist.