Lessing Park is frequently visited by kids, families, and dogwalkers, and often hosts birthday parties, picnics and other celebrations. It has proven to be a solid testing ground. On the downside you will need to careful; unlike other high traffic spots, people here tend to have more time to observe what is happening in and around the park. I'm pretty sure I was surreptitiously photographed by a suspcious (but well-meaning) parent while planning the cache.
The first phase of the field test was generally a success. Waypoint 2 went missing which was a shame because it took a while to construct. Sadly the hiding spot at GZ was demolished which necessitated this second phase of field testing. A new waypoint has been added. Sadly the old container at GZ has been retired until I can find a suitable new location; the new container at GZ is a very different type. The new container is bigger, but I've retained the original log.
Waypoints 2,3 and GZ are at S33 41.ABC E151 06.XYZ, so for each stage you only need to obtain the decimal part of the minutes, ie. ABC and XYZ.
NOTE: As a temporary measure you will need to make some adjustments from coordinates obtained at WP3 - see hint.