I figured out how to entertain Calvin for a while, draw a bunch of clocks in a coloring book. He has spent hours looking through this book and is always thrilled when he sees a clock.
He helped me out in the kitchen the other day while I was cooking dinner. He lined up all the bottles then put the lids on them.
Wearing his John Deer Hat. It's a little big, but does the trick.
If the zoo isn't exciting enough, it's also full of treasures that Calvin insists on picking up.