We would not swim to Green Cay off beach without mask, snorkel, and fins - too hard. On the swim to Green Cay, we leave the Club O beach much closer to Papagayo than the Perch. Coming back, we shoot for Watersports starting out - and try to come in well South of the Perch. Be cautious doing this sans any garments - not because of "legalities" or where you land - but because unless you really lather on some very water proof sun screen, you really have to be careful about spending a lot of time snorkeling without better protection than sun screen. Depending on your skin color, this is especially true when you are doing this snorkeling pretty tanless as we usually are. The other reason to stay south is that it is safer - the jet skis, banana boats, etc do not usually go too far south. You do have to have an eye open for things as you do this swim.