CPR, if that isn't included in basic first aid.

Defensive driving for anybody who has a driver's license. The bulk of drivers I see would be well-served to obtain additional training.

Why It's Not Okay To Have Loud Cellphone Conversations Where You Will Annoy Others.

Swimming. Everyone should swim well enough that they won't automatically drown if they fall in the lake or river.

Firearms. I don't insist that everybody be Todd Jarret, but I do think that everyone should know safe gun handling skills and be able to shoot in a way that will at least frighten a paper target.