When I went, it was nice to find a spot on the deck that was quiet - the pool and some other areas are noisy, but some areas were not so crowded and the people that were there were reading books or just staring at the sky. The clothing-optional area was usually empty.
The shows were not worth it on the boat I was in. The sales meetings disguised as events were total crap. The food was good, very good, or excellent.
We went to Bahamas and did research ahead of time to find a nature guide - didn't want just the touristy things that you book from the boat (we did a little of that, not much). 3 people were on the tour, so it was individualized ... we told the guide ahead of time what types of things we wanted to see, and got to see it. One other person on the tour was interested in bird watching, so there was bird-watching too.
When the boat docked in Nassau, and we walked into town, the first 3 blocks were terrible. There were tons of people who came up trying to sell stuff - time-shares, tours, meals, etc. It was very annoying. If you encounter that, just keep walking, try to smile and say no, thanks.
Be ready to just relax and soak up the sun. Take stuff to read or knit or whatever. I took a digital camera that I could bury my face in, frame my perspective with a zoom.