OMGGG i'm the only person i ever met that does bookmaking as a hobby!!!!
i did not list it in my application activities. instead, i mentioned in my personal statement that i started out with an extensive artistic background and how my perspective is a strength in the medical field (creativity, attention to detail, combined with passion for humanitarianism and scientific methodology and technique...)
and beyond that, you have an opportunity during interview because they usually ask about what your hobbies are.. and that's when i mentioned bookbindery.
it's not worth mentioning otherwise if its only a hobby... unless you did some kind of community artistic endeavor in volunteering. i wouldn't fill up that space unless you really can't think of 15 extracurriculars/work experiences. i use my art skills in volunteering for gardening projects in the city, and helped design a water pump.. so i mentioned these things in my non-medical volunteering activities section. i also mentioned teaching arts & crafts at a kids camp. otherwise i didn't list that my hobby is bookmaking. i just talked about it in the interview.
i hope that helps!!