Just man up and get her done
think of how you'd feel if your wife did that to you? If you really love your wife you wouldn't do it, or you would at least tell her so she could leave your unfaithful dirty ass :)
It won't happen on the trip, but it is a good place to start. A shared experience. Be her travel buddy. Sit by her on the plane, share meals with her, sit by her on the bus or van, be charming. Then when you get home work your way into her pants. Worked for me, and she was a demon in bed. Repressed something.
Oh yeah? how long did it take you once you were back home? And was yours married? This red head is single but a pastor daughter and seems very committed and all