A small outfit on Calle Erizo in the village, selling the trips that define Holbox: the whale sharks offshore in summer, the Yalahau freshwater spring and Isla Pájaros on the lagoon side, and the night walk to see the bioluminescent plankton light up in the shallows.
They take bookings by WhatsApp rather than email, which on Holbox is normal — the island's phone signal is better than its postal service.