As far as travel guides go this one is not bad. You are provided with facts, hotels, places to eat, and etc. However, the guide does little to help make suggestions on things that you MUST do in order to maximize your trip...there are no example daily itineraries or "don't miss activities".
AS others have pointed out there is much less detail given on St. John. Part of this is do to St. John being much less populated and developed. If you are spending multiple days on St. John you may need an additional travel guide.
What you are given is a collection of interesting facts that will help you enjoy your trip.
My suggestions - Snorkel a Secret Harbor Visit St. John's Trunk Bay Eat at "The Herve" Eat at the all-you can-eat buffet on Wednesday night at the Marriot's CoCo Joe's if you are into Jewelry - bring some extra $$$ for the (alleged) deals in Charlotte Amalie
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