I've seen individual fans separated by 20 feet or more from the rest of the galleries. It always makes me think about how cool it would be to just have incidental passers by, pedestrians, going and coming to and from houses, buildings, cars, etc., in the periphery while you're playing a casual round, without spectators or galleries.
What I'd really like to see even before that would be golfers in action up ahead of you and on adjacent holes. Nothing really all that intricate, but something that would convince you that you aren't playing the course in your own little vacuum.