I think that it is not only important to do those things that you really want to do, but as you get older to also "mix things up" a bit and make sure you do different things every day even if they are routine: it is not good to have two or three days in a row when you basically do the same thing every day.

BTW, I like the white water story. I also did this https://plus.google.com/u/0/photos/117612439870300277560/alb... my favorite: https://plus.google.com/u/0/photos/117612439870300277560/alb...