Like so many things...it depends.

Some applications have a section specifically for extra-curricular activities; if that is your case, then just list them there.

If not, and your activities are significant, I would create a separate section of your resume and treat them as a work experience (with Situation-Action-Result, etc.). Extra-curricular activities, particularly after college, are often great showcases for solid leadership, fund raising, etc.

If your XCs don't involve significant leadership, etc., then I would put them under the "Other" section of your resume (or whatever you happen to be calling it).

I hope this helps--

Paxton