Not only on which hole, but what time of year? I made sure I added an extra element to the equation to make a quick and affirmative answer more likely: the 15th tee on Marquette Golf Club's original course on Christmas Eve in 2004, with temps below zero and in about two feet of snow. My excuse in us trudging out there (it's about 300 yards from the relative warmth of the golf shop) was that we were scouting sledding locations for her family members who would be visiting later that week.
She said she didn't think anything was up until she turned around on that tee and I was on a knee (though it was buried in snow), shivering like crazy, with a ring in my un-gloved hand and snot coming out of my nose. Call it the anti-Bob Huntley scenario.
In hindsight if I had dropped the ring in the snow my spring would have been decided for me right then and there to spend a lot more time in that spot with a metal detector.
We saved Cypress Point and the rest of the Monterey Peninsula for the honeymoon.