When you first shared the great news that you and your daughter were going on a cruise, you had some slight hesitation about not being able to swim. So, I was pondering your recent comment, and I realized (as I started looking online) that there's quite a bit of helpful information on the web. There's even some videos. I thought that maybe if you watched a YouTube video, or read hints about beginner swimming for adults, that might be a good first step, toward helping to minimize some of your apprehension.
Then, maybe down the road, you might even have some interest in a local, adult group swim class (just for the basics). You see, I'm partial to pool or ocean swimming, in that I've loved the water ever since I was a little kid. When I was 5, I got my first swimming credential (I was awarded a "Guppy" skill recognition card!!
). Lastly, you don't have to swim in deep water until you're ready, and it's toward the end of your swim lessons. The funny thing is that swimming in deep water is exactly the same as swimming in more shallow water. It's not scary at all!
Lastly, it's not required that you know how to swim to go on a cruise. The above was just some rambling thoughts I had this afternoon. You'll have a great time on your cruise!