The secondary issue is, if there is no vacation, should I still do the day trip? I'd like to, it would be fun and D3 needs these experiences so her childhood is not a dud. I really have no expectations for the trip....or for any other interaction for matter.
That was your answer right there! If you can have no expectations and enjoy yourself, and it will be healthy and fun for daughter, then why on Earth wouldn't you go? By all means go for it, but remember to have fun, be indifferent, not cold and have boundaries ready to go into place if needed. Be the spouse only a fool would leave! This is another GREAT opportunity for you to shine. Bring your A game, SM! Hurry back and tell us all about it. Enjoy!