I would take a course on lucid dreaming. I would pick this topic because it would be interesting to be able to have direct control over my dreams to see where my mind will take things. Either that or a course on how to recall dreams after awakening. Sometimes a lot of interesting ideas come in dreams and you lose them right after you wake up.  Sure, logic would odds are show how weird those ideas were, but sometimes you can still take something from that.

If I could, I would take the superpower of being able to make clones of myself, but not only that, but I can absorb the clones back into me and retain the memories of what the clones experienced.  That way I can just send a clone off to a meeting while one of me is working on a different project or train myself on more than one subject at once then merge back together.