My sister is headed to New Orleans and is looking for advice about at a nice spa there. I don't really have any, so please respond in the comments if you know of one.
Here are a few that look promising:
Travel and Leisure magazine calls the Belladonna Day Spa one of the 10 coziest spas in the U.S. (Note to self: visit all of these spas.)
They also mention the Ritz-Carlton Spa in an article about spas that use local ingredients. (I hope that means they serve Hurricanes.)
And the Guerlain Spa in the Roosevelt Hotel also looks promising.
Hope you have a relaxing trip!