Huddy, TBH I was surprised by your not telling your W about the trip and fearing her reaction. I think that it is great that you are going on a trip you really want to do and to somewhere you really want to visit. Your life should be full of stuff like that.
Whereas I would not rub her nose in it, I think in your place I would have told her. But seeing at this stage you have said nothing I don't think that is bad either. Sooner or later she will know about the trip and the fact you didn't feel obliged to discuss it with her will also cause reflection on her part.
Either way you are living your life now and her getting upset about what you do is not your problem.......... as long as it doesn't affect your co-parenting.
Enjoy the trip.
I will also take this opportunity to give my thoughts on your in house separation. Firstly I think that this is a huge part of you becoming a better man. It made you strong. It made you grow. I understand your feelings on wishing you could have moved out earlier. Don't underestimate the impact on your W seeing you handle it so well.That could still work in your favour. And more importantly in the future you can look back and say you did not leave.It was W who left. This is not a blame game but more so you won't be subject to inevitable doubt or regret. Many people that leave wonder later if it was the best thing to do.
Happy thoughts
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together