If you belong to every possible club and organization at school, you can describe your extracurricular activities as omnifarious, or as including all different varieties.
This handy adjective means "of all kinds or varieties." You might recognize the Latin prefix omni- from other words that have the notion of "all" or "every." The -farious part, Latin for "part or parts," is the same one you see in multifarious, an adjective that is more common than omnifarious and has roughly the same meaning.