How to book, and the markup
Almost every operator below sells direct, through its own site or a booking widget. The same Fajardo bio-bay kayak class lists at $69 on one reseller and $89 on another; the resellers are convenient but you pay for it, and when a trip is cancelled you deal with the reseller, not the person who owns the boat. Book direct, read the cancellation terms before you pay (bio bay operators are strict, see below), and keep the operator's phone number for the day. Small operators here increasingly take Cash App at the dock; ask.
The three bioluminescent bays
Puerto Rico has three bays where dinoflagellates light up the water at night. They are different trips and you should pick deliberately. All three: go on a dark night, ideally within a few days of the new moon; many operators cancel around the full moon. No sunscreen or repellent on your skin before you get in a kayak; it kills what you came to see. Quick-dry clothes, no phone in the boat, and the photos will not come out anyway. Discover Puerto Rico: bio bays
- Laguna Grande, Fajardo
The most visited and the only one you can do as an evening trip from San Juan. You paddle a mangrove channel in the dark to a lagoon that glows where the paddle hits. Minimum age 6 or 7 depending on the operator; children share a tandem with an adult. Kayaking Puerto Rico and Pure Adventure both run it from Las Croabas. Read the terms: Pure Adventure's sales are non-refundable for any reason, tours run in rain, and a missed ferry or flight is your problem. Transport from San Juan adds about $39. Kayaking Puerto Rico Pure Adventure
- Mosquito Bay, Vieques
The brightest bioluminescent bay on earth, certified by Guinness in 2006. Black Beard Sports runs clear-bottom kayaks, about an hour on the water, minimum age 5, with pickups in Isabel II near the ferry and in Esperanza; full refund with 24 hours' notice. Abe's runs kayaks from $70 and a snorkel-plus-bay combination from $150. An electric catamaran (Isla Nena) is the no-paddling option but needs six guests to sail. Black Beard Sports Abe's Snorkeling and Bio Bay Tours
- La Parguera, Lajas
Less bright, more fun: boat out, jump in, and watch your arms glow. Paradise Scuba runs the bay trip from $70 and a sunset cruise with empanadas, a mangrove-channel swim and the bay from $85. Swimming is allowed but not guaranteed every night. Pair it with the southwest beaches. Paradise Scuba and Snorkeling
Ziplines
Toro Verde in Orocovis, 90 minutes from San Juan on Carr. 155 km 32.9, is the one people fly in for. The Monster is a 2,530-meter cable, 380 meters off the valley floor, flown face-down at up to 95 mph: $114.99. The regular Zipline Tour, about two and a half hours, is $89.99; The Beast, a shorter superman-style line, $59.99; Monster plus Beast $109.99; a family package for four $330. Riders must be 100 to 270 pounds and at least 4 feet; closed-toe shoes; arrive 30 minutes early; every ticket is final sale with no rain check, and cable speed drops in strong wind. Book the morning, when the valley is clear. Toro Verde (operator)
Closer to San Juan, Hacienda Campo Rico in Carolina runs a zipline course through EcoQuest, and there are rainforest zipline parks on the Luquillo and Río Grande side of El Yunque; their sites were unreadable to us in October, so check prices with them directly.
Rum
- Casa Bacardí
Across the bay from Old San Juan. The Legacy Tour is $40 plus tax for 50 minutes with a tasting; the Maestro's Walk, a seated tasting in an aging warehouse, $80; the mixology class, two cocktails, $80; the Founder's Experience $125; bottle your own $195. Minors can be in the pavilion, shop and food area with an adult but not on a tour. Reserve; change or cancel 24 hours ahead. Getting there is half the fun: the ferry from Pier 2 in Old San Juan takes 12 minutes and a shuttle runs from the Cataño dock, about 20 minutes door to door. Parking on site if you drive. Casa Bacardí
- Castillo Serrallés
The Don Q family's 1930s hilltop mansion, with a 45-minute guided tour, a rum-history exhibit, a butterfly garden, the Japanese garden and the Cruceta del Vigía lookout. The operator's tour page says adults only and asks for reservations 24 hours ahead; the museum's own site lists under-3s free, so confirm who can come before you drive to Ponce. Prices show only in the booking system. Museo Castillo Serrallés
Coffee haciendas
- Hacienda Buena Vista
An 1833 plantation restored by the island's conservation trust, with the coffee-husking mill running on its 1892 machinery and a corn mill driven by water from the Cañas River falls. Reservations through Para la Naturaleza, 787-722-5882. Discover Puerto Rico: Hacienda Buena Vista
- Hacienda Tres Ángeles
A working farm with a crop-to-cup tour, a tasting terrace and a restaurant. It hosts the January coffee harvest festival. Discover Puerto Rico: Tres Ángeles
- Sandra Farms
A small farm walk and tasting with a view to the sea, plus chocolate from the owners' Apasionados line; booked through Airbnb Experiences. Sandra Farms
Casa Pueblo's Madre Isla coffee and forest tours in Adjuntas are on the caves and salt flats page.
Catamaran and snorkel days from Fajardo
The east coast's standard big day out: a boat to Icacos or Palominito, the uninhabited cays off Fajardo, or across to Culebra, with snorkeling, lunch and an open bar. East Island Excursions sails from Puerto del Rey: the Icacos sailing day is six hours and all ages, the Culebra and Vieques power-cat days are six hours with minimum ages of 4 or 6, and there is a sunset sail. Food and drinks included, flotation for everyone, check-in 45 minutes before. Non-refundable inside 24 hours; weather cancellations by the company are refunded in full. The Spread Eagle II sails from Villa Marina with a sandwich buffet and piña coladas, and every guest keeps the snorkel. Prices live in each booking engine. East Island Excursions Catamaran Spread Eagle II
Horses, ATVs, karts
- Carabalí Rainforest Park
Rainforest horseback rides for ages 3 and up, one to two hours; a beach ride for ages 8 and up, two and a half hours; guided ATV from $80 for riders 16 and over; go-karts from age 3; a bar and grill open 11 to 9. The easiest family activity on the east side. Carabalí
- Campo Rico
Horseback from $70 an hour, $90 for two; ATV from $80 and $120. Campo Rico Trail Rides
- Toro Verde ATV
$99.99 for an hour; drivers 18 and over with a license, passengers 12 and over.
Surf lessons
Rincón in winter, Luquillo's La Pared the rest of the year. In Rincón, Puntas Surf School charges $100 for a two-hour private lesson and $80 a person in a group, with three-day packages from $200 and board rental $20 a day; Rincón Surf School runs three-hour lessons at $120 a person; Surf 787 starts at $80 for two hours and also runs paddleboard tours from $70. One instructor per two or three students, lessons from 7 am. Puntas Surf School rates Rincón Surf School Surf 787
Scuba and snorkel
- La Parguera wall
A reef wall four to six miles out that drops into the Caribbean trench. Paradise Scuba: wall dive from $145, reef dive from $130, Discover Scuba for the uncertified from $145, reef snorkel from $70.
- Tres Palmas and Desecheo
Taino Divers at the Black Eagle marina runs two-hour snorkels and shore dives on the Tres Palmas reserve and boat trips to Desecheo, the uninhabited island 13 miles off, where the water is as clear as it gets. Summer for Tres Palmas; in winter it is a 20-foot wave. Taino Divers
- Escambrón, San Juan
Scuba Dogs runs Discover Scuba and snorkel lessons in the protected marine park, the only reef dive you can do from the capital without a drive. Scuba Dogs
- Crash Boat
Shore snorkel around the old pier pilings; details on the day trips page.
Kitesurfing and wing lessons: 15 Knots in Isla Verde is the school nearest the airport and moves lessons to wherever the wind is. 15 Knots
Old San Juan on foot, with food
Spoon runs the Walk and Taste, three hours and five or so stops through the old city, from $139 a person at 10 am daily, and a Sunset Walk and Taste from $149. Flavors of San Juan has a three-hour food tour, a two-hour rum cocktail tour, a two-hour El Morro tour and a walking history tour. Both book direct. If you would rather do it yourself, the route is on the Old San Juan page. Spoon Flavors of San Juan
Not on this list, on purpose
- The Camuy caves, closed since 2023; the Arecibo telescope site, now a weekend science center; and Cueva Ventana, which is open: all on the caves page with current status.
- Fishing charters have their own page.
- El Yunque tours and the rainforest itself are on the rainforest page; the free self-drive is better than most tours.
- Any operator whose website is a parked domain or a casino ad. Several once-reputable names have lapsed; if the site looks wrong, it is.