We did this tour with a large group of kids and adults and it was the highlight of our trip to Phu Quoc. We arranged the tour on WhatsApp, and customized it to fit our needs (right down to our BBQ lunch options for our picky eaters - chicken skewers were a hit!) The tour was very affordable and well worth the cost!
I felt like our guide, Windy, was very patient with all the kids and was attentive to their safety. We snorkeled in two locations, lounged at a beach, went fishing, and finished the day at another beach location where the lunch was prepared. The kids (ages 4-10) really loved the snorkeling portion even though most of them had never snorkeled before.
Windy was kind and checked in with the adults often to ask if we wanted to move on, adjust lunch time, needed more time in any areas, etc. He was great at adjusting to our needs and answering LOTS of questions from curious kids.
I highly recommend Pacific Boat for your Phu Quoc trip, particularly if you need an activity for a large group. The tour FAR exceeded our expectations!