In the old times, rich people didn't have to do anything and they could just stay at home.
Some had very interesting hobbies, from philosophy, science, land-management, art, music, etc. Some brought great advancement to science or art or such..
Even some people living on the edge of poverty brought great advancement to science or art... For example Van Gogh, he was very unrecognized at the time of his life, but became famous later.. I really LOVE some of his paintings.. Could you imagine the world would be better off without him?
I think some of his paintings really make this world more interesting and BEAUTIFUL!
Maybe you can become an expert in something you are very much interested in?
You can then maybe even make money from this interest/hobby? Like build an affiliate marketing niche around it, with interesting articles?
(Or just impress people with it later on?
)