If you had all the time and money needed to do it right and well, what hobby would you take up? And by “hobby” I mean “thing done purely for joy that you do not turn into a business or otherwise monetize in any way.” Remember those? Hobbies? Remember how they used to be a thing before we decided “side hustles” were really glamorous because apparently we are only valuable if we are constantly producing something?? (*breathes into paper bag*)
Anyway, let your mind wander and write about what your wonderful hobby would be.
Or, if you are a true unicorn of a human being and actually have a hobby, definitely write about that.