Anonymous wrote:The Unsinkable Greta James by Jennifer E. Smith.
Not the lightest of light reads since it deals with grieving, but it's not too heavy and overall a good ready.
The main character goes on a cruise with her father, taking the place of her mother who passes away. It was meant to be a special anniversary (birthday?) trip. If I remember correctly there are other adults on the trip who were couple friends of the father and deceased mother.
+1
I was about to post about this book, too. I really enjoyed it and have recommended it to friends who felt the same. Great balance of light and substantive.