You should've stopped at the scoff. Someone qualified to handle children in a classroom and in field trips is already qualified to take them to a beach.
I think you may be misunderstanding, which is perhaps understandable given that I didn't unpack what it meant - see my sibling comment. But scoffing without asking for more information isn't a great strategy for learning.
I grew up in a beach town and gone to the beach in kindergarten all the time with the school without any special certifications. In the event kids go into the water there's always a lifeguard on duty already so otherwise it's the same as any other school outing, I'm not sure what the difference would be from leading a group of children in a city walk for example which to me looks way more dangerous.
