What education would you invest in?

I have around 15-20K dedicated to investing in myself. I can invest in some form of education that will have a long-term payoff, not just short-term pleasure, something that will significantly enhance my life and career.

Apart from that, there’s no constraints. Anything’s game, from a program at MIT, taking classes at an MBA program, a Tony Robbins seminar, invest it in stocks, real-estate, or private equity, a one-month yoga retreat in India, or just buying time off from paid work to build a company or climb a mountain.

What do you think would have the greatest impact?

What would you do?