Honestly, if it isn't posted, pretend you don't know. The person that someone heard this from may not have been as strong a swimmer and would cause some concern to the lifeguards. Swim like you normally would but before you get into the ocean, if you have never done it before, Know that it is much harder to move with the current pushing against you. Be smart and know your abilities and the conditions. Take a safety swimmer and show you are taking precautions and you should be fine. The worst they can do is tell you to come in and you can take pictures on the beach with the tourists instead.