I spend a lot of time waiting for things to happen. For this picture I spent around an hour following the groom and his "best men" around the golf course. Its surprisingly difficult to get good pictures of a group of men playing golf. Apart from the tee-off they don't spend much time next to each other, making it difficult to get a good picture of the whole group. Even at the tee its not easy to get a good combination of action, composition, and faces.
This is where patience becomes important. You've just got to stick with it and wait for the pictures to happen, as here, where the groom tees off and the four friends are all visible and paying attention.