In our county, one of the time periods of our day is labeled "Self-selected activities." I even use it in our Daily Schedule (I love to hear the Kinders say it: We will enjoy self-selected activities.
Well, you get the idea. It is a ton of fun. I either walk around and interact with them and help them problem solve or I work one on one completing the many many assessments that Kindergarten teachers are very familiar with.
I see the best interactions during this time. One little boy pats his friends on the back when they are sad. One boy cleans up his own space and then goes to help other people clean up theirs (I love it!). We work through the bossiness ("You can't be the teenager! I am the teenager!") and the sadness (one child is always a little worried about the bus-still!).
My kids all play together: smart ones, ESL kids, kids with special needs, shy ones, and yes, bossy ones. They are learning fabulous lessons that will help them the rest of their lives.
I love self-selected activities.
We do it every single day.
So, do you play in your class?