Im no authority on this as I've never taken one, but personally I'd say if you aren't already good at creative writing then why bother? And if you are, then again, why bother?
I think your time would be better spent doing a more specific literary course to help you learn the style and structure of the medium you're interested in, eg. poetry, novellas, short stories, screenplays etc...
I think though the best thng to do if you know you are a gifted writer is to read a lot of books similar in theme to those you intend to write, and if non-fiction be prepared to do a lot of research so your content is worthy of publication. And again if you are not particularly gifted at writing, then Im not sure if a course will make you proficient enough to succeed. It is important to remember just how competitive the industry is; a lot of great writers don't get published.
I love to play football (soccer) but I know Im not naturally gifted at it so I don't aspire to play professionally as it would be a total waste of my time.
But it is up to your specific circumstances - perhaps you haven't done creative writing in some time and you simply wish to hone your skills. Or perhaps you have written something already and feel it could be improved.
If I were you I would acquire a creative writing book so at least you'd have an idea of the methods you're likely to be taught and can then decide whether you want to take it a step further.