Hi Mike!
Suggestions:
***Somehow..you must convey how happy you are and that you had a nice time away from "Dad/H" responsibilities.
***Tell her you are thinking about joining a travel club or some grp type of thing that you think will provide some diversion for you, when it's her turn to be with children.
***Tell her what a great mom she is and take off quickly...(make it short and sweet)
***If you can carry it off...wear a bit of women's cologne(not what she wears)or have a pair of ladies sunglasses in you pocket...say"oh these belong to someone from work".
I don't endorse deception,but when you are trying to save marriage and family,sometimes you have to pull out all stops.

Have some fun Mike and relax..she'll be back!
Jenny