Hedge funds but you need a lot of cash to get in the door. Don't know your situation.
Whatever you do, don't listen to the naysayers who say who can't make money short-term, and it's "only a long-term investment." That's bullsh*t. Just means THEY couldn't do it.
Anyway, this subject is so complex, it can't be answered in one post. Bottom line: it's been a great way to make money for me. So is real estate but there's a whole topic there.