The below tip is outdated you can now add multiple stops in de google maps app by default. You can do this by clicking the three dots in the top right and select "add stop"
never been easier
- Open the on pc or Mac add multiple destinations here.
- Copy the URL and email this to yourself or share it via google keep or pushbullet
- on your android/ZTE open the link
- The route including the multiple destinations is opened automatically in Google Maps.