Direct contact with the author often results in gaining a repeat customer, or one who will recommend your work early and often to other travelers. You may want to put a note in your books saying that, due to time contraints, you are unable to plan readers' itineraries for free, though you will answer questions not answered by the book. Write articles for newspapers and magazines which include your byline and the title of one or more of your books. I wrote an article for the New York Daily News once. Do bookstore signings, appearances and lectures.
Most bookstores are happy to do the logistics.
All you need to do is to show up and talk for awhile. Talk to a local travel agency about sponsoring a slide lecture on your destination or specialty. The travel agency and restaurant do the publicity. The travel agency gets the bookings, you get book sales and recognition. Sell yourself effectively to a talk-show producer and the chances are good they'll give you some airtime if travel fits their format.