Recommendations for Activities for Tween/Teen Boys (Santiago de Chile)

Hello,

We just moved to Santiago last week, and have spent most of our time searching for schools for our kids. We're now down to 2 options, and have started the application process...

Now, onto finding activities!

Can anyone recommend great places to go/things to do for 11 and 13 year-old boys? Rock-climbing gyms, swimming pools, other clubs, scouts, etc.? I know some of these will take place at school, but we are looking for other avenues to do things and meet people too.