Hi momof6gals, welcome to Cruise-Chat! Congratulations on your upcoming cruise, just be warned, cruising is addictive
Dunn's River Falls is a great excursion. I think Jamaica is a beautiful island. It's just like being in any large city, you just have to be aware. Stay in a group and preferrably with a ship sponsored excursion.
Have a great time and a marvelous cruise!