Falmouth with a 4 year old- waterfall and dolphins?

Sailing to Falmouth with RCI in February and looking for ideas for a shore excursion in Falmouth- we'll probably just do beach days in the rest of the ports on this cruise (Cozumel and a private island). Anyone done the combined Dunn's River Falls/ dolphin encounter excursion? Would a child who just turned 4 enjoy it? I'm OK skipping the climb up the falls and just watching other people do it if that's too much for her. The other one I looked at was the rafting on the Martha Brae river but I thought she might get bored.

The falls I think would be too dangerous for the LO to climb up for sure.