Let me give you one example :a ten day holiday in vietnam where tourists can learn abouts the local customs and culture and ,at the same time ,help the economy of the country.only local guides and employed to show the tourists the sights and expain the different customs and culture. The tourists stay in locally owned hotels and can buy souvenirs made and sold by the local community.in addition,the tour operator supports a charity which enables the poorest children to go to school and the company also helps protect some endangered to go to school and the company also helps protect some endangered animals.so,you can see that this holiday can make a difference to local people