Not to worry...........Chankanaab park will still be there. Some trees may be down, but if you are going for the snorkeling, I guarantee the water and fish will still be there !!! Lovely park, you will have a nice time. If the itinerary changes, there is pretty much snorkeling at every port you go to. If not, you can always save it for your next cruise, and I also guarantee there will be a next cruise !!
You'll love it no matter what changes are made !!!