Which bay is closest to where you're staying

Most people pick a hotel first and think about the bay second. That order is fine, but it does decide the answer: two of the three bays are on opposite ends of the island, and the third is on a separate island entirely.

Find where you are sleeping below.

Staying in San Juan, Condado, Isla Verde, Ocean Park or Miramar

Go to Laguna Grande, in Fajardo. About 45 minutes by car under normal traffic, via PR-66 and PR-53. It is the only one of the three bays you can visit and return from in a single evening without restructuring your trip.

La Parguera is about 2.5 hours away by car from San Juan, which makes it a separate day rather than an evening. Mosquito Bay needs a ferry or a flight to Vieques and, realistically, a night there.

Staying in Rio Grande, Luquillo, Ceiba or Fajardo itself

Go to Laguna Grande. You are already on the road between San Juan and Fajardo, or past it, so the drive is shorter than the 45 minutes quoted above rather than longer. This is the easiest position on the island to see a bio bay from.

If you are in Ceiba or Fajardo, you are also at the ferry terminal for Vieques, which makes Mosquito Bay more practical from here than from anywhere else on the main island.

Staying in Ponce, Guanica, Cabo Rojo, Lajas, Rincon, Aguadilla or Mayaguez

Go to La Parguera, in Lajas. You are on the south or west side of the island, and La Parguera is the bay on that side. Driving back across to Fajardo would mean crossing most of the island in each direction on the same night.

La Parguera is also the only one of the three bays where swimming in the water is allowed, which is the reason some people plan a trip around it rather than treating it as the nearest option.

Staying in Dorado, Vega Baja, Manati or Arecibo

Go to Laguna Grande, but add the drive from where you are to San Juan on top of the 45 minutes, since you are west of the city and the bay is east of it. If your trip already includes a night in San Juan or on the east coast, the bay fits far more comfortably on that night than on this one.

Staying on Vieques

Go to Mosquito Bay. You are already there, and it is the brightest of the three, holding a Guinness World Record for it. Check the moon calendar before you book: the Department of Natural and Environmental Resources closes Mosquito Bay to tours on the night before, the night of, and the night after every full moon, so those three nights each month are not a poor view but a closed bay.

Staying on Culebra

There is no bioluminescent bay on Culebra. Reaching one means returning to Ceiba or Fajardo by ferry or flight first, and from there Mosquito Bay on Vieques or Laguna Grande in Fajardo are both realistic.

On drive times

Only two drive times appear above, San Juan to Fajardo and San Juan to La Parguera, because those are the two this site has checked. The rest of this page tells you which bay is nearest and why, without quoting a number nobody here has verified. Check your own route before you book a tour, and leave more time than the map suggests: every tour on all three bays departs after dark, and arriving late means missing it entirely.