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.
All I ask is a tall ship and a star to steer her by; John Masefield
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, 2016
Star Clippers: Royal Clipper 2015