With respect to Travellers and Tourists:

"Traveller" is a profession; "tourist" is a hobby.

Being a traveller represents visiting a place in a relaxed way, not paying so much attention to the well-known sights or monuments. It is enjoying the atmosphere surrounding a definite spot and getting in touch to its people, customs and traditions. A traveller spends quite a long time and a great deal of money on a journey.

Being a tourist refers to a constant haste for a period of time. A tourist visits a place and goes to a destination that a friend of his/hers told him/her and takes advantage of it to see the more attractions, the better. Tourists generally go to cheap hotels and eat bad meals and are not usually into the ways of life of the population of the place they visit.