See a different side to Wells Gray on the Ray Farm trail, which showcases the park's homesteading history.
An old farmhouse looks out over a gorgeously lush meadow area, which also features two mineral springs. The walk to the Ray and first mineral springs is only 1.2km return (mostly flat).
Continue another 1.2km and you'll find another mineral spring, this time bubbling out of a volcano-shaped cone. Wildlife is particularly prevalent in this area. This trail can also be hiked as a 4km loop.
Personally though, I'd recommend a short visit to the main farm buildings and first mineral spring only. There are so many things to do in this park and I think your time is better spent elsewhere.