First off, the Rhino Rider experience was great, pretty much what we expected from what was advertised. I have no complaint at all on the in-boat experience. My only comment on the Rhino Rider outift themselves is that they advertise "secure lockers", which it is not. Our stuff rather was kept in a laundry basket in their lobby. If the clerk stepped out for a minute your stuff could be easily gone (which ours was not).
I would strongly advise people to avoid booking through saintmaartencruiseexcursions.com (e.g. Island Marketing), which we did. While they are about $25/person cheaper than through the cruise line, they are not reliable. When we showed up, Rhino Riders had no record of our reservation, and the time that Island Marketing had advertised was one hour early, there was no actual trip at that time slot. To Rhino Riders' credit, they explained that while they are not Island Marketing, they would make it right, and they sent us out on a personal tour with their guide venus. Rhino Riders should probably stop doing business with Island Marketing instead of hiding behind the fact that its a different company.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.