For tourism it is important to get a good background in general business management and marketing management - start looking at Coursera for that. There is also an excellent course series on Coursera in the field of hotel management. Although hotel orientated it is very applicable to any tourism career. Find this course series here: www.coursera.org/specializations/hotel-management
At iVersity there is an excellent course on tourism in the context of the modern digital era, really essential that you understand tourism from this perspective. Here is the course link: https://iversity.org/en/courses/etourism-communication-perspectives-october-2016