Hey folks, I have a spare $40k

I want to know if its worth it to buy a mining rig and if so, what should I buy and how do I run it?

Or is it better just to put the cash into bitcoins and just sit on them for a few years?

I want to try mining just for fun, but am a complete noob.

Someone please enlighten me.

Note, this is cash that I can afford to lose, but obviously I'm looking for a profit