water temperatures in January

[orchards]

We'll be in Belize City week of Jan 19 on Holland American cruise. We are seniors and are considering either snorkeling or cave tubing for our day in port but are concerned about the water temperatures.

 

I understand that January temperatures in Belize range from 70-80 degrees F.

 

What about the water temperatures in the Cayes or the cave rivers? Comfortable or "chilly"?

 

As options,any comments on airboat, city, cave or Mayan tours?

 

Thanks