Paul, I do not think there is a best bunker at least in my minds eye. however, Hell's bunker at TOC, green side bunker at 17 as well as the 11th hole are great. I think Tom did a great job on the bunkering at Pacific dunes as well and I agree with Joel as to the quality of SFGC's overall bunkering but still would not say best in US. I really like much of the use and style of Coore and Crenshaw's bunkering for modern courses.