I don't need to convince her I'm a good parent, and I don't need to add more awesome family memories to our legacy.
Maybe not your W, but when the kids remember DisneyWorld, it will include their dad. You will be spending only small periods of time with her, so you won't be proving anything, except how great you are at dinner time. You could even flirt without giving anything tangible except your wonderful company.
I would think this is just a step in a long series of steps toward your goal. Of course, the trip may not materialize, so probably not worth worrying about until it does.
In the meantime, don't share all that you do --- be somewhat mysterious and don't always give her what she wants (i.e. your company whenever she feels like it). I wonder what she would do if you went out on a date? Not that I'm advocating it, but if it presents itself, maybe an innocent one might shake things up???
Just throwing ideas out there.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim