Do you live in the US, do you qualify as an accredited investor (net worth greater than 1 million , or joint income greater than $300,000)?
If yes, you might have more options open to you: private equity, investing directly in firms, crowd sourced real-estate, venture capital, etc.
I think you also have to define what you are looking for more clearly.
If you really just care about about return, and have very high risk tolerance, you could just go to a casino and put it all on a random number on the roulette wheel: it's risky and the average return is not great, but the upside potential is huge ($100k to 3.6 million). I doubt that is what you have in mind, though it seems to meet your criteria the way you have posed it.