(I can't sign off without asking whether you and your bathing colleagues had previously eaten a few batches of spicey Costa Rican food?? There again, you didn't mention any smell did you....)

Well, of course we were eating spicy food, but, that t'wernt it. No smell. TINY bubbles! Montezuma is at the southernmost tip of the Nicoya penninsula, Pacific side of Costa Rica. There are several seperate beaches, Montezuma beach, Sano Banano beach, Red Rock Beach, Long beach(that of the bubbles) and the Black Sand beach. It is my understanding that the Nicoya penninsula was formed by a lava floe. My guess is there is some type of gas (prolly CO2) escaping through the sand in that one area that causes the bubbles. I just wanted to know if any of youse guys that actually know about these things might agree with my theory. (still looking for the perfect pic link but have to leave for pottery. This spot saved)