Golf is a a game because anyone who says that Tiger Woods isn't trying to beat the crap out of Fuzzy Zoeller is as ludicrous as anyone who doesn't realize by now that figure skating is an activity. Games are more significant than activities but less significant than sports. An activity by definition is anything that is not a sport or a game and is therefore less significant than the others. Activities frequently employ judging that determines the ultimate winner. Thus, the results are subjective and generally highly-questionable.
Some activities serve no real purpose other than creating a demand for beads and sequins.
It is common for activities to be dominated by teenagers and children. The above criteria result in the following categorizations. I would appreciate your comments and suggestions and will be happy to clarify any of the designations. I will also be happy to make a ruling on an event not listed and include that event in its appropriate category. Downhill skiing was added as a sport per a ruling-request and heavy lobbying effort by Thomas R. King of the Department of Management.