January 2018 - 6 days on Norwegian Jade
In Roatan I booked the B.O.S.S. Underwater Adventure through NCL Jade. It's a submersible scooter, similar to helmet diving. It's run by Ocean Connections and they take underwater pictures of your group and the fish so it's great if you do not have a camera. For a fee you can have all the pics taken during this excursion. On the boat they also provide juice & peanut butter crackers. Tip: bring a towel from the ship's pool.
Bring only a carry-on & backpack and do laundry in the sink using the ship's bar soap.