We chose the shortest of cruises available. For the time of one hour, it was a fabulous experience on an amphibious vehicle driven by an experienced and entertaining guide who related information clearly. We had a lot of fun.
We didn’t see stingrays, dolphins or turtles, but did learn about some birds. The views of the river meeting the ocean and the coastal area of 1770 were beautiful. Before we boarded our cruise, two earlier, longer cruises arrived back. The applause and happy comments from the people disembarking indicated that their tours were highly successful. I think that if seeing turtles or dolphins etc is important and you have the time, the longer cruises would be a good idea.