? Best book to give DH to help plan solo trip?

[tink's girls]

Hello! My husband and I have recently started talking about planning a trip to the World for just the two of us. I will (of course) use the Dis to plan the trip, but he will enjoy reading a book. We already own several that we have used when planning our trips with the kids, but I wondered if anyone had a suggetion for a book specifically for an adults only trip! Thanks!