I think that grass can be a great challenge to the course. There should at the very least be a walking path and fairway/putting area that is cut to no more than 4" in height. But outside of that, I think that high grass can make for a really annoying obstacle. For example, on Falling Creek Park in Bedford, VA, hole 3 is 525' in the short (550' in the long). About 340-350' out there is grass that is rarely cut. There is a 15' wide part of the grass right where your roller would go if you throw it correctly (either a long low roller or a sky roller). It's a pretty cool design, forcing you to hit the gap if you're going to roll it. There are also other parts of the course that have high grass off the sides of the fairway. It adds a good obstacle. It's not too bad of punishment, but it's just enough. It's sort of like the fringe on the green or the light rough along the fairway in ball golf. I like it.