Variety is good for your brain, but it will overwhelm you after a while. You get used to it and a blind spot appears. With the information I have, I'd suggest planning your day around one activity. Be on theme.
You start your day with a goal and imagine how you can achieve it. The planning is one activity by the way. You plan for house long you will do any given thing continuously and where the pauses will be. One hour and then fifteen minutes rest? After a pause, you can reflect upon the subject, write about it, see if you haven't stayed off course, basically process, rinse and repeat.
It's weird being this generic,, unfortunately I see no other way.