I spend most of my time on this wikibooks improving the book I am the principal writer of, Animal Kingdoms. I also fix grammatic errors if I see them. I have currently requested for adminship.
I have also started a sort of 'project' to add links to the contents pages of pages in books. The templates start with BT in their name, and are named according to the book they are 'serving'. Feel free to edit out or change this templates, as I am not sure if they are appropriate for some settings.
I also have an account on the Simple English Wikipedia with the same name, however I am most active here.