Went to ocho rios too and did the dunns river falls. Not very adverturesome so I didn't enjoy it much, but my sister, who's very outdoorsy, loved it. don't forget to bring you water shoes as i felt the shoes that you can buy/rent we're kind of old. as for prostitutes, didn't notice if there were any. some of the shop vendors can be aggresive, but no more so than at a state carnival in the states. just say no thanks and walk away.