Whilst staying in Denham we went in to Monkey Mia a few times and one time was to do the wildlife sailing cruise. We took the mini cruise option that went for 1 hour and concentrated on dolphin spotting, it was enjoyable but you see the dolphins come in to shore each morning so it wasn't really worth doing the cruise as well. If we had of seen other animals like dugongs or turtles it probably would have been more worth it. If I did it again I would choose one of the longer cruises to hopefully get more out of it.