Travel means to travel for recreation. Or just for fun Tourism is the main industry of the country. Which brings revenue to the people of Thailand and foreigners entering Thailand.
Tourism means traveling for recreation or for fun. The main industry is tourism, a type of Thai country. The Thai people's income and the British people into the Thai nation.
The tour is a trip to recreation or fun. Tourism is a major industry of Thailand, which type of income from the people of Thailand and foreign to the inhabitants of the country.