That kind of depends what counts as "play". The only instruments I'm really comfortable with (and can play "anything" on and improvise with) are keyboards and guitar. But when I need to learn a simple melody, I could probably learn it on any instrument. It's just about practice. (The violin is really hard to sound good on though!)
So okay, um, I can "play" drums, bass guitar, all kinds of guitars, keyboards, accordion, some harmonica, some flutes and water glasses! Maybe I'm forgetting something.