Spend time with him VS. Go on cruise.?

Ok, here is the situation. My husband works offshore. He works two weeks and then gets to come home for two weeks. My mother, sisters and I are going on a 4 day 3 night cruise. It will be just mom and her girls no husbands allowed. Here's the catch, the ship leaves out the day he comes home. My husband say's I am being selfish and I don't care about him, spending what little time we have together away from him, It's dangerous, and that I should be using the money I have saved up for the cruise on something that will benefit our family. I understand how he is feeling and I really hate to be away from him. On the other hand, I have never been on a cruise. I really want to have this special memory with my mom and sisters. My mom bought my ticket as a Christmas gift and I'm not going to spend an extravagant amount of money (which I have worked really hard to save up for) by any means. I can't imagine us ever getting coordinated with our work schedules and other responsibilities enough to do anything like this again. When my dad ped away I wished we had done something like this with him. A memory to have of just us having fun together. I don't want to have this same regret with my mom. I wish he would understand how important this is to me and I am not doing this to get away from him. I love him with all my heart, but I feel like he is the one being selfish, not wanting to allow me this small amount of time with my family. Am I being unreasonable? Are my priorities all wrong? I would really appreciate an unbiased opinion. Thanks