You might want to think about renewing your vows onboard in case there is some sort of weather or other deviation in itinerary.
I've not been to Tortola but Antigua has some beautiful beaches. You might want to check out Nelson's Dockyard if you are a history or yacht buff.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015