1) I'd let the kid choose.
2) Anything including horses, except perhaps Thoroughbred racing and eventing (too many horrible accidents happening there ). Working in stables is good for young girls and women (and probably for blokes too), as it teaches them assertiveness, responsibility, respect, and teamwork. Many women in positions of power (CEOs and the like) have spent a lot of time in stables.
3) Parkour. Because it's the sport I wish I'd heard of before puberty turned me into a lazy-ass couch potato.