You pay a basic price for the day trip, and then add the price for one, two or three dives, depending upon how many you want to do. I wanted to do two dives and one snorkel, so that’s what I paid for. I was very happy with that. Another diver initially paid for two dives, then added the third dive while on the boat, so you can change your mind and add on (assuming there is capacity.). The service on the boat was great - it’s a very professional, well-run company. I’ll definitely go with them again. The dive master, Sam, is absolutely fantastic. She is one of those rare people who ticks every box for leading great dives, and is a lovely person to chat with on the way home. All around fantastic, memorable day. Highly recommended.