I myself have a bit of some negativity about these excursions. Have been on a few of them over the years in the DR and the last one in Puerto Plata did it for us. Once you pay you are in their control until they drop you off at your hotel. We went on a 4 wheeler wife, myself sister and brother inlaw. They put us in a cattle truck with benches and since we were 1st to be picked up we were in for a cattle truck experience. The dust the diesel fumes were overbearing. We went from hotel to hotel picking up other customers. Then we get to the 4 wheelers and were treated like objects not humans. It ****ed me off so bad it almost got to throwing fists. after the 4 wheelers it was back to cattle truck and visiting all the hotels dropping guests off and we were last since we were picked up 1st. NEVER AGAIN. This is just one story.
Post the name of the tour company and excursion so others can learn, ideally in a new thread as this one is about a specific destination.