YY totally agree about dividing the day up into intense interaction time, and then more hands off things and having a sort of list of each type of activity.
For example:
Morning: Breakfast, hands off.
Mid morning: Interaction
Late morning: Snack/nap
Lunch
Afternoon: Outdoor
Late afternoon: Hands off
Dinner, wind down, bed.
If you want to be even more organised at this you can write yourself more specific lists of what you'll do each day. This is quite good for example because it allows you to pre-prep stuff, so if you think OK, tomorrow is going to be an arctic themed day so before I go to bed, I'll set up all these toy polar bears on a white blanket and then he'll have something to look at when he wakes up. You can then have a leisurely morning not having to be super involved, once you've woken up a bit, you could get some little toys you've frozen into ice out of the freezer and have some fun whizzing those around on a baking tray/tuff tray or something, letting him bash at them with a toy hammer, giving him a little pot of warm water to pour on them to see what happens etc.
Go for a walk and look for frozen puddles to crack or just whatever he's interested in. Then your afternoon time might be putting on the film Happy Feet or something.
I am too disorganised to do the planned out activities thing but it would probably help bring some variety to your day. If you don't want to do a load of plans in advance you can also just make some lists.
Things toddler can do without me:
Watch TV
Play with toys I have set up (list toy sets)
Aquadraw mat
Ramp for cars
etc
Things that I can keep half an eye while drinking tea:
Sensory play
Colouring/stickers
Marble run
Obstacle course
Things that need active involvement:
Housework tasks
Playing doctors
Building towers to knock down
Throw the ball
Tickle race
Places to go outside:
Local park
River to feed ducks
Leaf hunt
Puddle splash walk
Library
Look for squirrels
Corner shop
etc etc