I have a twin brother, so we always entertained ourselves. However, when we were that age, we used to make treasure hunts for ourselves, write stories together, and play in the snow. We also lived on the same block as like 5 other kids, so we always had friends to play with.
Yeah, I'll have to ask what the other moms in our hall are up to the next few weeks. There are no kids his age in our neighborhood to play with, so I'll have to set something up with the kids in our hall. I'm not sure which moms work and which ones don't, though. But he does need a little more social interaction.
Teach him to dance. Get that done early.