I will answer with regard to my view of what is done - not with regard to legal technicalities. If you are off a boat, then your captain answers the question as to C/O. If you are off beach from Pinel, I would say no - definitely no if you are off beach from west side where the main activities are - there may be some who would think C/O OK if off beach from north or south (usually deserted) beaches, but I would not recommend it. Green Caye itself always has been treated as C/O, depending on whether anything is going on there and if so, what. So, same thing as to off beach snorkeling from Green Caye.