To me the most amazing thing about Feynman was his enthusiasm for relatively mundane things such as the Rio Carnival, stripclubs, the bongos, painting and the fixation for going to Tuva which is a place forgotten by both god and men.
You'd think a guy who accomplished the things he accomplished would find it harder and harder to become enthusiastic about stuff, because of the effect of the hedonistic treadmill.
Somehow I think his biggest accomplishment was his ability to slow down the hedonistic tradmill.