Excellent episode overall with the exception you mention about the annoyingly preachy nature of McG's sermon at the end. This tendency to long speeches seemed to worsen as the seasons progressed, especially as Jack Lord gained greater creative control over the show.

One big plus is that they actually filmed it on Maui, a nice touch, they could have easily filmed it on the west end of Oahu which back then still had enough open land for the effect they wanted. From some of the panorama shots I'd say it was filmed along highway 37 and Keokea in the hill country east of Wailea-Makena. The coast down there is full of resorts now but that hill country hasn't changed.