Too Long; Didn't read version of this review: Celebrity has seriously understaffed this ship, and the service suffered significantly. In addition, the entertainment has gone from "alright" to "I think this is the Nursing Home" with regards to the events in the main "club". Avoid this ship, and possibly Celebrity, if this refresh of the Summit is where they're going with their cruise line.
--Disclaimer--
I should start this out by saying that my wife and I are serial cruisers, and selected another Celebrity sailing because we had an outstanding time on our Honeymoon journey on the Reflection in the Med just a year ago. We knew what Celebrity was and wasn't (is: more low key, is not: 24/7 party central) before booking this trip.
The kayaking is a great strenuous way to explore the island.
Bayonne is great for embarking, but there's literally nothing to do.