Monique Wells moved from Texas to Paris in 1992 for a job, and she ended up staying indefinitely. Like generations of Americans before her, Wells and her husband fell in love with the City of Light. But since she went there as a veterinary pathobiologist, and not as a tourist, it was years before she asked herself where she’d go if she only had a few days in Paris. Then Wells and her husband, Tom, started a company that created custom travel itineraries. Travelers would fill out questionnaires about their…