How long is your cruise? If its a week or less, just double up on your biweekly injection the day before you leave. For example, if you are injecting 250mg twice per week, just do one 500mg shot before you leave and then hit another one when you come back. It's long esters....no big deal. Don't over complicate things. It will literally make zero difference, but whatever you do....DON'T TAKE INJECTIBLES WITH YOU (unless you have the script to go with it)