Look at the posting of "LynneB2013". She is your age and already has a back-to-back cruise booked out of San Juan on Celebrity Summit for March 19-April 2 I think. It goes to different islands the 2nd week.
Look down till you see LAST POST on Jan 6. I would like to do this trip myself but probably can't do 2 weeks, so I'm just trying to help out as I browse through.
Jun2009-Alaska - Celebrity Mercury@ Vancouver
Dec2009-Mex&C.A.-NCL Spirit @ NOLA
Mar2010-Aru&Cura-HA WesterdamDam @ Ft. Lau
Dec2010-Caribb- MSC Poesia @ Ft. Lau
Dec2011-S. Caribb- Emerald Princess@Ft Lau
Apr2012-Bahamas- CCL Fascination@ Jacksville
Jan2013-E Caribbean- RC Brilliance @ San Juan,PR
ApMay'13-VolgaRiver-MS Chaikovsky-Rostov to Moscow