If you're looking for a waterfall you'll be disappointed, but take the jet boat ride. We just got back from our cruise and one of our stops was St. John.
I went on the boat ride with my 2 children aged 23 and 20. We had a great time. The owners are very friendly and helpful and the boat driver was lots of fun. He must have done this a million times and yet we all commented that he seemed like he was having as much fun as we were.
Bring a change of clothes because you'll get wet, but it's well worth it.
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