Sassafras root is still used to flavor traditional root beer, although since sassafras was banned by the U.S. Food and Drug Administration because of the carcinogenicity of its constituent safrole, most commercial recipes do not contain sassafras. Some commercial root beers do use a safrole-free sassafras extract.
There are usually 18 holes in a golf course; some have 9 holes or some multiplier of 9 holes. I have played at golf clubs with 9, 18, 27 and 36 holes. However, a standard round of golf at most golf clubs / courses involves 18 holes.
A regulation 18-hole golf course should be between 6,200 and 7,000 yards. To calculate how many miles you walk from the first tee to the 18th tee, multiply the number of yards by three (the number of feet in a yard) and then divide the result by 5,280 (the number of feet in a mile).