Question
We are tourists.

Question: Who is a tourist? --- is this question sentence natural to native speakers? If not, could you tell me how to express it naturally?

Question

Question
We are tourists.

Question: Who is a tourist? --- is this question sentence natural to native speakers? If not, could you tell me how to express it naturally?

Answer

The sentence is natural. 
But - I don't know if I understand the scenario you are describing, so I don't know if it is natural in that context, or if there is a better option. Can you be a bit more explicit about what you want to express?