Ours is also not a recent report...but our son (who has cerebral palsy and uses a walker generally but a wheelchair in the parks) went on the pirate cruise when he was 8. I also asked whether one parent could accompany, but was told no parents. At the time, DH and I were too nervous to really enjoy that hour or so of freedom (how long is it?) but our son and his twin certainly had fun!
Please ask about the plan for the cruise and whether they ever get off the boat...I seem to remember a time when they go exploring on an island? Our son stayed on the boat, but the CMs did a good job of giving him an important role so he felt included.