My wife and I went on this tour on the 11/9 cruise. For $22, we thought it was worth it. We also tipped our guide $5 and gave guides at two forts $1 each.
The tour is fairly basic, but you get to see a little more of the island and the way the people live. Just driving by the different residences, from old ones to very nice houses, was interesting, and to see the kids in the playgrounds at several schools (each school has different color uniforms). The tour goes through downtown and then to the Queens Staircase and two forts. At the forts, a different guide walks you through and gives a "canned speech", which was ok, but the views were very nice - you could see the Wonder in the harbor down below.
We also drove out to Cable Beach and back - not much else really, but a nice 2 1/2 hour overview. Our tour was from about 10 to 12:30, so we went back to the ship for lunch and then took a taxi to Atlantis to look around later.
In sumary, the tour is interesting, but I would not expect the kids to come back with any "rave reviews".
(We did catch a glimpse of them filming a James Bond movie, but my wife was upset because we did not see Pierce Brosnan....I don't know why!
Nick
