If you plan on visiting one or more of the three Puerto Rico Bioluminescent Bays, use this interactive calendar to plan your trip around new moon phases, when it is darkest at night, so you can maximize your Bio Bay experience. Choose a month, year, then click “Go”.

<script type="text/javascript">// <!]></script><script src="http://www.imooncal.com/cs/mc.js?ln=14255973286111201" type="text/javascript"></script>