What makes a good day for your child?

It can be done with sibilings instead of parents as well if similar age. I spent my years before primary school playing with my sisters (1 year and 3 years younger than me) playing games devised by us, since we did not have any real toys

Good days are doing familiar things or things planned together. Bad days are being asked to do something without notice.

A good day for my 3.5 year old son is one where he gets a lot of one on one attention. Whether that's taking him out on his own somewhere or just doing whatever he wants at home without chores or his brother getting in the way. He loves to tell me how to play with him or explain what a certain toy is etc. 

Bad days include unexpected trips, or worse, cancelled trips.