Spitfisher mentioned something that I had thought about in the past..
In my area golf course paths are off limits at all times except for golf carts. I imagine there is risk of people going and damaging the course after hours
But.............I don't know how many times my wife and I go out for a walk or a bike ride in the evening and have to go in the streets when
it would be really nice to go (after hours) in widened and paved cart paths. I am sure young joggers would also use them
Clubs could have teen camps and lower cost for students with proper ID
Just throwing out ideas as I write
Going for a walk or a jog on a golf course is a dangerous activity. My home course absolutely forbids it because of liability concerns. If someone sneaks in despite the postings, then gets hurt by an errant golf ball, the course doesn't get hit with the same liability that it does if it was allowed. Since I've never seen "after hours" at a golf course, that doesn't even apply. My home course is open for play from 5:30 AM in summer until after sunset.
My home complex has two 9 hole courses as well as the 18 hole course and it does hold junior camps in the summer. They are usually held on the par 3 course, so that the Executive 9 and Championship 18 are available for regular play.