We didn't get to go on this highly touted NPS hike--we were on St John for 10 days, heard about this from the National Park volunteers the first day, and it was already totally booked up for the entire time we were there. We signed up for the stand-by list but everyone showed up, so there was not room for us.
Why is it so popular? Because the NPS drops you off at the top of the mountain, guides you through the island's flora and fauna down to a bay where you have a nice swim, then the NPS arranges a boat to take you back to their HQ for $30---sooo wish we could have done this!
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