Why care? After U.S. Navy occupation of Vieques ended in 2003, word spread about the island’s unspoiled scenery. “The main threat now is the big push to develop Vieques for tourism,” says Mark Martin Bras of the Vieques Conservation and Historical Trust. This has led to a boom in unregulated tour operators and too many swimmers bringing sunscreen and bug repellent that kill the delicate dinoflagellates. Construction and
deforestation unleash light and sediment that are also dimming the waters.
Plan your trip: The biobay is accessible year-round and is best viewed during a new moon. A regular 90-minute ferry runs from Fajardo, on Puerto Rico’s east coast, to Isabel Segunda on Vieques. (Cost: $4 round-trip.) Stay at Hix Island House (hixislandhouse.com); lofts start at $185 in summer.
How to help: The Vieques Conservation and Historical Trust (vcht.com) advocates for the protection of the biobay and lists licensed guides.