One of those predigested novels for all those people who can't afford to take a world tour for $25,000 and find they can get loaded or laid for a lot less--namely by going along here with travel entrepreneur Kenneth Tare who lines up a lot of interesting far-off places, whether it's a castle in Scotland or a redone monastery in a small West African Spanish colony. Co-travelers, only to be differentiated by their luggage tags, are a schoolteacher, a young married couple who haven't been getting along, two who are more settled, and a bridal pair including the mother of the bride. Most of the real trouble centers around the Karajaks--he's a hood, she's a pretty Eurasian--and they're dealing in drugs. . . Diner's Club blueplate special.