Legion of Honor may not sound as the best place to propose but it has it's advantages. First one is a clean & classic look. Second and probably is most important, it's protected from wind and it can be a deal breaker for those whose hair tends to go "all over" in a bad weather. And 3rd advantage is that location offers a number of backgrounds including the columns shown in the photos below as well as greenery outside. Oh, almost forgot, Legion of Honor has a shade even at noon.
Planning a proposal at Legion of Honor is simple and requires a very simple set of instructions.