Honey, I can't really give you any helpful feedback as to what might get your baby to play, as I do NOT have that problem with Mason....as a matter of fact, I wish he was a little more tame!
What I do know is Mason LOOOOOOVES his Kong
. If you haven't tried it yet, I'd definitely recommend it. Of a million toys he has, his Kong is about the only thing he consistently plays with. It's a little rubber ball (or cone, rather) that you can put treats into. I've put peanut butter, jerkeys, meat treats, and fruits in the Kong to keep him active. It keeps him occupied for a period of time and it's my savior
Hope it helps!