The first one was found at Shimizudani Park in Akasaka, just across the street from New Otani Hotel and Akasaka Prince Hotel.
Top right to left:
Take your own trash home. This facility is for everyone. No bonfires or fireworks.
Bottom right to left:
Be kind to trees and flowers. Do not feed animals. Do not do things that are troublesome to others.
Next one was found at a parking area close from Mitakadai Station.
Keep the leash on your dog.