I don't know what is available on RCL. We did Southern Caribbean out of San Juan on Celebrity in 2018. For St Lucia, we did the zipline. It was a lot of fun. It did arrive back late to the boat, so I was glad that we have booked the Celebrity excursion. They were waiting for us. For St Kitts, we did a small group snorkel. There were less than 10 people. It was nice. Barbados we just walked from the port to the Mount Gay Rum tasting room. There really wasn't a sidewalk or good way to do this, so beware. It wasn't dangerous though. Just walked on wide areas of grass between buildings and the road. The tasting room was cool. There was a deserted beach across from it that was really pretty.