Seems to me a "tourist" is someone on a tour and a traveller is someone going somewhere.
A tourist on a tour does not necessarily have to have a fixed itinerary and a traveller does not necessarily have to have a fixed destination.
A holiday maker is someone on holiday.
If the grammar police want a real howler, how about touristing as a noun?
No one on TD is gay. If suspect, it was probably because of the way they were reared.
I apologize if any offence was caused. unless it was intended.
You people, you think I know feck nothing; I tell you: I know feck all