Hi
Travel and Tourism has little relevance to CS as the latter deals with Companies Act and related matters. If your passion is Travel and Tourism, then I would not suggest you waste your time doing the CS course. However, if you are academically inclined and have a strong liking for legal and secretarial matters, then you can pursue the course which could take you at least an other 3 years to complete, if you clear the exams in the first attempt. (Unlike graduation and Travel & Tourism course the exams are not so easy to pass)
Think twice before you enroll for the CS course. Also meet a couple of Company Secretaries and discuss your plans with them before you plunge into it.
Best Wishes