I used to run hunt tests; AKC, NAHRA, and UKC.
Honestly too much time spent in a lawn chair at the tests for me. It also got to be in conflict with matches, so something had to go.
Wife still does with our dogs (Goldens).
We've got the entire south end of our 9 acre pond turned into a "technical" pond for retriever training and another smaller 1/2 acre pond we put in for "swim bys" etc.
We built coves, fingers, channels and an island. The island "briefed well" until the cover got so high that we couldn't see the dogs. One year mowing by brining a push mower across on a boat was enough to turn the island into a "lollipop" and we just drive the zero turn over. We've also turned one smaller field into cut rows to teach younger dogs to push through cover. We also put in "handler's" mounds so you can see the dogs work the channels etc.
We'll often have groups out for training days, so I literally have to schedule my shooting days with my wife when I want to do long range stuff.
Part of our retriever training area: