What would be a good day trip from St. John to the British Virgin Islands?

Can you answer wantsarevolution’s question about Caribbean?:

My family and I are staying on St. John, and we’re interested in taking a day trip to the British Virgin Islands (any of the three, Tortola, Virgin Gorda or Jost Van Dyke). Most of the ferries leave around 8:30am and get back no later than 5pm, so it has to be something we can do in one day. We are two adults and two college-aged kids. We enjoy sightseeing, snorkeling, beaches, etc. Any suggestion for which island to visit and some fun sites to visit?
NOT St. Thomas. Been there, done that.

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Any suggestion for a Caribbean vacation?

Can you answer Trouble’s question about Caribbean?:

So it looks like a Caribbean vacation is the best way to go for the best deals and prices for the vacation I am planning on going on, but I have no idea what island to go to… Any suggestions? The more detailed the answer the better (and more likely to be chosen best answer). Thanks!

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