We're taking a bit of a combination approach to our kids. Our six year old is currently taking piano lessons, but he can make the decision to stop them if he wants. He's also free to choose another instrument. We didn't prod him into taking lessons, but it was our suggestion.

As far as physical activities go, we are letting him choose his path. We're avid climbers, and take our kids with us to the crag, but never force them to climb. Some days they insist on climbing, other days they're happy exploring the woods. Both kids love riding their bikes (which also fits with our lifestyle), and our older son has taken a liking to soccer (though again, we suggested he try it).

I think it's also important that parents provide the opportunity for their kids to have autonomy. If they aren't exposed to different things, they'll never take the initiative to be passionate about something.