The fee you pay on Carnival covers transport and climbing the falls. There are several different tours available that include the falls. Last year we did a snorkle and falls trip with transport by bus. This year we took the "Cool Runnings" catamaran falls and beach tour that turned out really well. Rode the Cat to the falls, did the climb, and then walk back down beside the falls ( excellent photo op ) to the water. Back on the cat (open bar & loud music) to the beach for 2 hours and then back to the ship. The trip is pretty structured so not a lot of time to wander off on your own.
8 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway, Escape
11 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay X2, S/V Vela
HAL Statendam, MSC Divina