This means I do keep a list of the things I need to get done, so whenever I've got free time, I take a look at the list and see what I'm most in the mood to do.
Of course, this is the real world -- sometimes something has a firm deadline so you have no choice (so of course you do things you aren't in the mood for).
But I want to run errands when I'm in the mood to go outside. I want to go to them gym when I'm feeling energetic. I want to wash dishes or clean my apartment when my brain is conked out anyways. I want to work on a hobby when I'm feeling creative. I want to read a book when I'm feeling relaxed.
Or at work, I might be in the mood for writing e-mails, or working on a presentation, or chatting about a project, or catching up on reading. They'll all get done eventually, but why not do the one you'll most enjoy at the moment, as long as you can?
And I know myself well enough to know I never have any idea what I'm going to feel when. Will I be feeling energetic or creative or conked out tonight after work? Tomorrow when I wake up? The day after on my lunch break? Who knows!
Scheduling time to do my things is a disaster for my happiness. I'm sure it can work for other people, but it's not for everyone.