Pretty much covered by everybody...Be friendly, big smile, Be mindful of when people are hitting shots not to distract them by driving up to them are driving around etc. stop, wait, then move on. People are more apt to buy things in between holes rather then playing in the middle of a hole.
One of the courses I often play at has in my mind a amazingly good cart girl. She has learned very well when to stay out of sight during shot making and when to approach. She also knows the regulars well. She never even approaches me as she knows that I never buy anything. But she always catches my eye and gives me a thumbs up or down sign just in case. I always pack a water bottle and refill on the igloo coolers full of water the course puts out.
A couple weeks ago during a really hot round this cart girl actually drove up to me while I was walking up the fairway on a par 5. Which was very unusual. She pulled up, apologized, then gave me a bottle of water telling me that the last two coolers were empty and being taken to the clubhouse to get refilled and she knew that I used everyone of them on a hot day walking my way around the course.
I told her the apology wasn't necessary, and I gave her a $10 for the water...which she was giving me for free.
Casual players may not care, but to better serve the serious golfer....its the art of knowing when to be seen and when not to be seen.
And just know that your going to be flirted with by men, plenty of whom can probably be old enough to be your father....or older. It comes with the territory I suppose. So just know going in.