Being able to perfectly imitate other people's voices; the pitch, tone and their accent, would be a pretty sweet ability with basically no drawbacks. Also you'd be an amazing singer.
Being able to see some way into the infra-red end of the electromagnetic spectrum like some animals can would give a person the ability to see heat, allowing them to spot living things at night and perceive things about a person's physical and emotional state, so that'd be pretty cool.
Being able to twist your body in air to always land in an optimal position to avoid injury like a cat.
The ability to throw things with perfect accuracy due to an innate sense of the weight and aerodynamics of any object you hold.
Being able to sense magnetic north like a pigeon.