He would love to hammer "nails" this way!! Grab a block of styrofoam at the dollar store (The green kind is floral foam. Put some tees in a bowl and have your little one carefully push each tee into the foam. Ready to clean up? Use that pincer grip to pull them out!
9 activities to do with a 1 year old...and older kids too. This actually seems like a list of things they can do. Somethings pinned are a little too advanced for someone who likes to bang blocks together and throw books. Just saying.
Someday, i may have more grandchildren! there are some cute activities. 15 (More) Independent Activities for One-Year-Olds - Imperfect Homemaker