What to do ?

What do we do with our toddlers during the day ?

I feel like I'm letting my toddler down , like I should be teaching him more things?

My son (3.5) goes to school from 8-2 and then he gets home we have lunch and then I have another 2 hours before I start cooking dinner , should he just be playing during this time ?

He plays with toys and scribbles (draws) but should I be making little work sheets and workings with him or something, I done know lol