heavens scent was up in mountains, we booked through our tour operator, it was'nt that far from where we was staying, the bus journey there was a experience, Mr Motivator was so lovely and helpful, my 13yr old son climbed up for one of the zip wire rides and when he got there he was a little scared so Mr Motivator climbed up to him and talked him through it all, he was great.
your 8 yr old will love the dolphin cove, theres areas where you can chill out as well as things to see, its not a very big place but big enough for a few hours depending on what you want
i think most hotels do the same things and if it is anything like the riu ocho rios, they are great with kids
if you go on trip advisor for jamaica just look at things to do and you will see these places i have spoke about, u must do the dunns river but watch out because we bought a dvd and when we got home it only played half way through so if u do buy one ask at your hotel to see if it works