We will be on the western caribbean in january, 2009. We just booked the tubing and zip line for the Belize Port with Action Boys Belize. They are offering the two tours for only $ 110.00, and if time permits we can do a free tour of the zoo. They only charge $90.00 for kids.
The tubing and zip line is the highlight of our cruise and we are excited.
X-Stream Cave Tubing is running a special on their Cave Tubing & Zipline tour for $99, you might want to check it out before you book. They run small groups so they may already be sold out but its worth checking out
X-stream is cheaper and smaller groups. I personally don't like ship tours, we did stingray city once with a ship trip and we had about 200 people, it was crazy. Since that we do thing in smaller groups, get away from line ups for a while