I am renting a private villa the first week of May and have just received an email from the owner about sharks. The email was forwarded directly from the Villa Nizuc (south end of HZ km20) property manager. It stated:
Due to the presence of sharks, the authorithy (Civil Protection) has issued instructions to our lifeguard, <name removed> who is the highest authorithy on the beach, to monitor that no one go into the sea more than 15 meters. It is for your own safety.
Guess we will stick to the pool. I will wade in to the ocean but not swim like I normally do. Bummer