I think trouble around the greens (water or sand) is the best way to protect a golf course. I think you need something down the edges of the fairways, either trees, high grasses, or water to penalize errant tee shots, but I think trees can be overrated due to getting lucky bounces back into fairways or knocking the ball straight down.
The thing I find unfair is blind tee shots particularly ones that hide trouble, and really long forced carries (say 175 plus) into greens. Around here locally, I'm also not a big fan of the "hit off the side of the mountain" par 3 where you tee off more than 50 feet higher than the green level.
The thing I find unfair is blind tee shots particularly ones that hide trouble, and really long forced carries (say 175 plus) into greens. Around here locally, I'm also not a big fan of the "hit off the side of the mountain" par 3 where you tee off more than 50 feet higher than the green level.