For one thing, if you go to a country like this, and if you plan to stray far outside the touristy areas, it is a good idea to register with your country's embassy there. That just means you fill out a card that shows a hotel or a wilderness area or whatever, and what dates you expect to be there. Then, if by some chance something unexpected happens and you turn up missing, and if your family contacts the embassy, at least they will have some information to pass to the local authorities. In this case, the Canadian embassy would contact the Jamaican Constabulary Force.
If you stay within the touristy areas around Montego Bay and do the normal touristy things, then that registration is probably unnecessary (but it can't hurt).