You don't need excuses if your deadlines are entirely arbitrary and imaginary :) Just stop when you've had enough, it's okay really ;D
Other option is have that as your overall todo list and pick one thing out of the fun list and one thing out of every other list to get done every day (or if one of the not-fun things is a really big thing, just that one thing) and when they're done you're done, go read all the books or whatever other things you consider restful :D
I love that your worm farm is multipurpose XD That area looks good :)
