In Ocho Rios, if you've never been before, I would recommend Dunn's River Falls. It is fun and something that is one of those "you got to do it". Then again there is rafting, Appleton Rum Tour, zip line and a general tour. All are interesting and fun. In Jamaica I would either book through the cruise line or pre-book with a reputable tour company.
On Grand Cayman you have to do "Stingray City". Other than that there isn't too much else except seeing "Hell" (overrated). It is basically a post office and some rock formations. You can also see the turtle farm. It is interesting if you are into that sort of thing. If you do Stingray City I would suggest that you do a tour that also gives you other snorkeling opportunities. I would do Grand Cayman on my own. There are tour providers, such as Captain Marvin or Captain Crosby who will give you as good, or better, tour than the cruise lines.
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"There is a great difference between being well traveled and just having been to many places." ~Me
We also reccomend "Dunns River Falls", (they have the best "Jerk Chicken"). It will be a great photo opp. If you deside to walk the falls, you have to rent some special shoes, (they are just like crocks, but cost 15$ to rent), before they will let you in the water. Also on "Grand Cayman" make sure that you visit "HELL", (It's a small town on the otherside of the island). Send your friends, boss or neighbor's a post card from there, telling them to go to HELL.
We love anything assocated with crusing and traveling. We are retired U.S. Navy...and loving it, "Been there...done that"! (almost).
MS Carnival Glory 11/2010
MS Carnival Liberty 11/2007
MS Carnival Spirit 10/2006
MS Carnival Victory 12/2005
MS Star Princess 12/2002
MS Carnival Victory 12/2000
USS Bristol County, LST 1198, 1980-1982
USS Turner Joy, DD951, 1973-1978
Ocho Rios, is one port to use the ships excursion or a good tour operator. We have used portpromotions.com, and here is what they offer...Compare with your ships tours, for pricing and groups sizing...
i loved swimming with stingrays in Grand Cayman~have done it twice and it was a little scary, but so cool...
ziplining in Jamaica has been the most adventurous thing i've done on an excursion and would recommend it to anyone if you can climb and aren't afraid of heights~it was a blast. Dunn's River is beautiful and if you don't want to rent the shoes to climb the falls you can walk the stairs beside it~although climbing is half the fun
be forewarned~the people in jamaica around the falls and out in the market areas will drive you nuts with their begging you to buy and hounding. i loved jamaica but have debated going back just for this reason...