hey..I'm not an expert adviser or something but I think that you are not exactly sure of what you want to do. I would like you to first sit and think properly of what you are thoroughly interested in. For courses in tourism or you can just select a few famous tourist places and start working on them. And one sincere piece of advice, if you really want to do civils, dont get discouraged, have confidence and you will do it someday. But dont depend completely on civils and tourism, dont forget, you are a mechanical engineer which is great.!So,keeping the degree you have already got,think peacefully of all the careers available and choose the best for you.!hope i did my bit by helping you.!