Swimming through the luminous lagoon is semihallucinogenic, especially on starry nights, when it's hard to tell where the water ends and the sky begins. The experience is made all the more surreal thanks to the mixing of salt- and freshwater from the sea and the Martha Brae River; the freshwater ‘floats’ on the saltwater, so you not only swim through green clouds of phosphorescence, but alternating bands of cold and warm.
There's a decent restaurant by the marina.