Is the tourism sector part of the service sector?I am refering to the GDP and its composition by sector (agriculture, industry and services).

If you break down GDP in this way, then tourism is most
definitely part of the service sector.

Typically, we say
that the service sector consists of those businesses that do not produce and sell
something tangible.  That is, a service is something that you cannot pick up and bring
home after you have paid for it.

One example of service
workers would be the workers at Disneyland.  They are paid to help you get on to the
rides, etc.  But they do not actually produce something that you can take home and
keep.  All they are doing is helping you (hopefully) have fun.  Fun is not
tangible.

Going to Disneyland is tourism.  So is going to a
resort in Hawaii.  In both cases, you do not get something tangible.  You are paying for
an experience.  Therefore, tourism is part of the service
sector.