Here’s a site that has a whole bunch of home made “play-dough” recipes and other crafts.
You could go on a treasure hunt looking for acorns, pinecones and stones to make little crafts with. You could glue the acorns onto a frame (to give as a gift to daddy or grandma), you can paint the stones with funny faces or animals, and you can use glitter glue on the pinecones to make pretty Xmas decorations.
You can make holiday cards or door hangers (use a hole punch to make 2 holes in the top section of your paper decoration and then loop a ribbon through the holes and tie the end in a bow. Use construction paper and glitter glue to make the cards or door hangers.
Here’s a site that has lots of kid friendly recipes to make with mom
Because Thanks giving is coming (I’m just guessing that you live in the U.S.) so you can make turkeys out of the outline of your son’s hand and then color them and give them as gifts or use them as place markers at your dinner table.
You can take a walk around the neighborhood or the park, then you can think up something and ask your son to see how many of them he can spot (birds, pinecones, people with yellow shirts, white dogs etc.)