The ruins of Sutro's Bath form an infinity pool right next to the ocean.

101_MG_0084 by ahab1372, on Flickr
The result was not as good as I expected and needed som pp. Maybe there was too much spray and salt on the filter already, plus Iwas in not really in a comfortable position, flat on my stomach behind (closer to the ocean) the camera bag, at the end of the concrete strip:
Click image for larger version.  Name: 101_MG_0094.jpg  Views: 69  Size: 134.7 KB  ID: 1086

Arnt