Hops,
Just wanted to add a little to this thread.
I had an incredibly close and loving relationship with my daughter and when she died I felt the loss of that relationship terribly, the friendship, love, sharing. With my son it never was that easy. I think at times I have tried to project that "ideal" relationship onto him but have had to learn to step back. He is very loving but in a different way. He makes plans with me often which he changes or withdraws from........ less these days I must admit but I had to not take it personaly. It was enlightening to hear that he does the same which his father so it is not personal. I think like lots of young people he is up for whatever is the most fun!!
I had to learn to build my relationship with my son and what I learnt is easy on the expectation, don't read too much into anything and take baby steps. You are communicating, that is what is important. I know it is painful not to be able to share the time together on the beach in an easy way but heck Hops, that is how it is with lots and lots of families. I have had idealised views of a family for a long time......... like other families were having such a good time but that is often on the outside. Maybe you and your D are being very open and saying what is real. She does not feel pressurised into taking a trip with you that she does not want to. Sounds healthy in ways. I recall being with XN and kids........we looked like something from 7th Heaven on the outside but there was ofen coercion to get everyone together and have "fun".
I also think a week is a long time when relations have been strained.......... baby steps, Hops
Sending you hugs
Axa