Also, make sure to bring an insect repellant rated safe for young children. Malaria is generally not a problem in the Placencia area. Placencia tap water is very safe to drink and hygiene standards are high. Therefore, Hepatitis A is not much of a concern here. Again, however, discuss this with your doctor - a Hepatitis A shot might not be a bad idea in general.
Most kids love to snorkel and swim.
Snorkeling gear may be rented in Placencia, but for young children, we strongly advise you to pack custom-fitted snorkeling gear. Young children are harder to fit, and the rental shops may not have sizes small enough to be comfortable for young children. At a minimum, bring a custom-fitted mask. A poorly fitted one is enough to ruin a great trip. First Cast, Teaching Kids to Flyfish , Phil Genova.