Originally the Sayulita diving school, now running private and small-group boat trips: the Islas Marietas, whale watching in season, snorkelling, and diving courses.
The Marietas are a national park and the famous Playa del Amor — the collapsed sea cave with a beach open to the sky — has a hard daily cap on visitors with permits allocated in advance. Any operator promising it without a permit is promising something they cannot deliver.
Three phone numbers are published without saying which is WhatsApp, so none is listed as one here.