I love sharing reviews on restaurants, because in my country there are many bad restaurants, thanks to google reviews we as a community can separate good places from bad. Now when going to a new place I am always checking reviews on it, since I started doing it I haven’t been disappointed.
Also when travelling I am sharing my experiences and photos about given place, which I think is especially important if place is littered, I believe posting photos and writing about it will have an impact to change that place in future, bring attention of local authorities to clean that place and start caring about it.
Adding new quality places is great as well, for example I ate at new kebab place, which I considered as best in my town, so I added them from my friends account, just to help out new bussiness reach new customers and evolve.