旅游的人 - people who travel. Quite colloquial expression. 观光者 - people who go sightseeing. 旅行家 - (professional) travelers. People who travel as their professions. 游览者 - people who go traveling. seldom used. 观光客 - guests who go sightseeing. Mostly used by hosts and sponsors. 旅游者 - tourists. 游客 - tourists. The most official and common expression.

To make up a little, 旅游的人 is the most oral and common use.

The mainly mean of “tourist"is"游客”

Yes. All these words mean tourist. 旅行家 means person who travels very often. The rests are almost same meaning. And 游客 is offen used in oral speaking.