Vanilla 2.6 is here! It includes security fixes and requires PHP 7.0. We have therefore ALSO released Vanilla 2.5.2 with security patches if you are still on PHP 5.6 to give you additional time to upgrade.
In addition to $Configuration['Garden']['Profile']['ShowActivities']= FALSE;, if you remove the "View Activity" permission from accounts, they won't be able to access the general Activity page either. (View Post)