We were very selective with the places we let Maxx off lead.
We own acreage south of Phoenix, Arizona that is 5 miles from any main road, and requires traveling nothing much more than a goat trail for the last mile or two. We used to go out there and let Maxx off lead. He was very good about staying close…he'd stop occasionally and look around to make sure he could still see us. He was also good about coming back to us when we called him.
We found another place on the Oregon Coast where there as a very deep beach far from a road, and since it was after Labor Day, the beach was empty of people. He had a ball chasing sea gulls...that is, until he finally figured out he'd never be able to catch any! Again, he was good about coming back when called.