Is there a quick and easy way to copy an activity?
There's no built-in functionality to copy activities - but my coworker wrote an extension that, amongst other tasks, allows you to copy an activity.  It's organization-specific - for instance, it specifically does NOT copy certain activity fields, and assumes the existence of certain custom fields - but if you've got some developer skills, this is 90% of what you need: https://github.com/PalanteJon/coop.palantetech.multipleactivities/tree/master