Dunns Falls/Blue Hole/Caves, or other ideas???

Hello! We have a group of 14 (6 adults, 8 kids ages 6-12) porting in Falmouth in a couple of weeks. We are planning to do a private tour in Ocho Rios, but can't decide what to do. Originally we had planned on Dunns River Falls, but the more I read about Blue Hole, it sounds really cool. Am I correct that doing both would feel redundant? If so, which one would you choose? And what would be a good second activity for the day? We don't want to to shop. I have heard of caves but don't know much about them. Other ideas?