Bodies of Water, La Parguera
Fodor's Review:
On moonless nights, large and small boats line up along the dock to take visitors out to view the Bahía de Fosforescente (Phosphorescent Bay) Microscopic dinoflagellates glow when disturbed by movement, invading the waves with thousands of starlike points of light. The bay's glow has diminished substantially from pollution -- both light pollution from the nearby communities and water pollution from toxic chemicals being dumped into the bay. (And, yes, the smoke-belching boats that take tourists to the bay are doing damage, too.) If you've seen the bioluminescent bay in Vieques, give this one a pass. If not, you may find it mildly interesting.
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