I love all the answers you have gotten so far. How about a collapsible tunnel? I like to have a mix of pretend play/ fine motor skills/ gross motor skills stuff and I feel like the tunnel falls into that category.
Oh, also a flashlight. And hats for dress up, and either a ride on toy or a toy he can push or pull (shopping cart, vacuum cleaner, or wagon) and play doh (we got cookie cutters so he could press out shapes, although it was a long time before that happened) and lift the flap books and a sit and spin (at two, he is finally figuring out how to really spin).
I found that in the late afternoon, my son needed some music to listen to.
Your daycare teachers could give you some suggestions too based on what he likes to play with there.
Also, it is so helpful to rotate toys.
Sorry about the rambly post , HTH.