I agree. Dunn's River Falls is something you should do once in a lifetime. It is $10 adults and $8 kids. They rent watershoes for $5 and sell you them for $15(?). You start at the bottom of the falls and climb up with a tour guide and a group of 20 people. There are many places they will gladly take your picture with your camera but expect to tip them at the end. They also take your picture and have it printed and ready to buy when you are leaving for $7. There are things to buy there but you have to go past a bunch of very pushy people.
Have fun.