Ha! I stumbled upon this spa in Sebastopol, CA : Mermaid Spa and Seaweed Bath Shop that gives Seaweed baths, Seaweed Muscle Soothers, and Seaweed Body Wraps! I'll admit that I wouldn't mind trying one, but it seems a little ridiculous to be using "Micronized Mediterranean kelps" when there's plenty of kelp in California! Very strange...
Seaweed baths are traditional in Ireland dating back to Edwardian times. Here's some info on doing it yourself. If you're going to Ireland and want the real thing, check these out:
Kilcullen's Bath house
Cliff House Hotel
