Offer different variants with selected pricing for each slot opened.
Booking Forms help you get maximum information possible from customers, which will help you serve them even better.
Create custom fields and get any information you need. For Example : Weight or Height of each Guest, Health issues (if any), etc.
Often Scuba Diving and Snorkeling Trips come with addons like Digital Underwater Cameras, Enriched Nitrox, etc. Add them as Extras and rate them separately. Making it easy for customer to select and they automatically reflect in the total amount.