public DirectionsApiRequest destination(String destination) {
    return param("destination", destination);
  }
The address or textual latitude/longitude value from which you wish to calculate directions. If
you pass an address as a location, the Directions service will geocode the location and convert
it to a latitude/longitude coordinate to calculate directions. If you pass coordinates, ensure
that no space exists between the latitude and longitude values.

@param destination The ending location for the Directions request.
@return Returns this {@code DirectionsApiRequest} for call chaining.
src/main/java/com/google/maps/DirectionsApiRequest.java