You are sooooo NOT alone!!! I've mentioned that earlier in this thread but I am here to say it again.
Our now 14yo DD ruined our excursion in Grand Cayman on our cruise last October, and I am still resentful about it. She is not an ocean lover like the other three of us and that is ok. We paid for and chartered our own private boat and skipper to take us to Stingray City, Coral Gardens and Starfish Beach. I booked this instead of going with a larger group so that she could have her own space and happily stay up on the boat instead of getting in the water with us if she wanted, etc. We talked at length about going and she agreed she would find her courage and would go along. Well, when the morning arrived, she started in. Begging us to let her stay on the ship, did she REALLY have to go along, etc. She had promised us beforehand that she would go with us and would have a good attitude. Off we went. She was in a mood the whole time and as soon as we boarded our little boat, she laid down, said she didn't feel well blah blah blah. We dropped anchor at Stingray City and instead of trying to be nice and acting interested, she just laid around the boat and didn't even lift up her head to smile or even try to be nice. I'm sure that skipper thought "WTH is this bratty girl all about". She was a bear the entire time and it was extremely embarrassing. WE WERE SOOOO MAD. We had the boat for four hours but cut it short by one hour, just anything to end the misery, and returned to the ship. She was all perky then and ready to head off the club....... DH and I went off on her like you can't believe. So disappointing to have to ream our DD on a Disney vacation.
What should have been an amazing day for us was very much tainted by our DD's 13yo venom. Talk about disrespectful, she had the corner on that one. Here we are on a
Disney Cruise and on a private charter in Grand Cayman. Could she be appreciative and happy about that???? No.
So, as you can see, you are not alone if feeling like "what could I have possibly done to raise such a brat?" It's very, very difficult to swallow, I know.
Big hugs to you. I am so sorry this trip did not go the way you had dreamed of in your mind. It's hard to take.