Bende practise was the following (Houston): walked him several time around a nearby area with a lake, had treats with us. Got him on a long (30 feet) leash after a while to practice recalls in that environment, then after a while (weeks) off leash once he got out the first burst of energy burned, but never first thing in the morning. calling him back from short distance, same as we used to do with the long leash. every walk was about recall afterwards for a good half year.
then we transitioned to a creek area (months later), did the same, lots of recall, not letting him go very far without hearing our voice. always considered the age where he was. started to trust him around 2 years old with very consistent recalls (i.e. coyote or deer encounter). we also traveled some, had hotels, parks etc. so it is not just one type of environment, bust many different ones to test and train at.