Research
Rigorously testing and expanding the edges of a Domain.
I conducted some professional research during my Uni-days but I didn't quite enjoy the concretized nature of thought that I had to stick to.
Given my polymathic inclinations, I plan on exploring the edges more like a vagabond than a military expansion - I find that to be more enjoyable and I'm not setting out with any expectations but, honestly, do expect to rediscover several pre-explored epistemological townships and maybe some day from the depths of the ocean to the edges of the Universe (via thought experiments (stretching the analogy a bit)).
Other than academic and industrial research, I believe humanity as a whole could benefit from individual exploration as well.