I went on a few De Palm tours during my three trips to Aruba, and by FAR the best was the ATV tour! I don't believe it was a DePalm tour, but it was definitely the best tour! I recommend it to anyone! Just make sure to bring lots of sunscreen for the trip!
I have not taken that many tours, but the sunset cruse is great. A large Catamaran takes you out and goes up and down the shore. It really is a good time without the ultimate craziness of the, for example Tattoo.
The boat is 100 ft, yes, big boat. It holds 100 people, when we went on last week it had 52 people for the sunset sail, and 98 on the snorkle cruise. You would never know that the boat was full on the snorkle sail as once you can start moving around it hardly seems or feels crowded. Love that boat !!!! Check out my photo's and you can see the boat and our snorkel cruise with our group of 20.