tag, painting, catch with a SOFT ball, read to him if he likes that, help him learn something, drawing-be sure to hang up whatever he draws, use playdough or clay to make things, make simple musical instruments to play-a drum or a rainstick, play a kazoo, string various types of cereal or macaroni. pick flowers for mom, draw flowers and you cut them out, glue them on pipe cleaners for stems and give to mom. have him help you make a picture frame out of cardboard and plastic wrap to frame a picture he draws. could do the same only use the frame to put pictures of fish behind for a pretend fish tank he can hang in his room.
well i babysit these kids and i turn everything into a game so when they dont listen i say ok the first one to sit on the couch wins and they all run to the couch and be quit until i get play do out or if u lay on the couch and say i have a bobo they will play doctor and all i have to do is sit there or even have a dance party but doing a lot of arts and crafts for a 3 year old BOY is tough i would not recommend it because kids dont like to listen and they dont like to sit still so try to play active games