Well I would be excited too! Cruising is awesome but with family, the experience is so much better. What is your husband nervous about? Thinking from a guy's perspective I guess I would naturally be protective of my loved ones and new situations and cultures takes one outside of their "safe zone."
It's natural to be nervous but if I can answer any questions I am happy to do so as well as all the great people who post here regularly.
Just post your questions and people will seize on the opportunity to help!