As I live in a contry that has not so much input on Google Maps, I try to add as many new places as I can. Doing so, I think about the information that is useful to further travelers or visitors. I find it important to add working hours to busineses and institutions, trying to be objective about upsides and downsides of the place. Also, using the knowledge that I have working in retail and HoReCa I try to provide an experienced eye on consumer places. I hope that this is beneficial to the visitor, as well as to the place/company, because they can improve based on my feedback.
As I travel with my wife and 2 children, I usually review families places of interest, wheather the restaurant/hotel/public place is kid-friendly (has playgrounds, kids-menu, bathrooms).
I try to be very active in responding to questions about places i visited because I like being helpful in my society.