Our group, for the most part, is made up of baby boomers who have settled into careers but still like a little exercise, like Jim (an appraiser) and Ann (a teacher), both Midwest marathoners with matching ankle tattoos (their initials). Others include a physicist, two nurses (one male, one female), a California surfer-turned-avocado rancher, and a few members of the under-thirty-something set, including Mike, a financial planner from San Francisco who says he had a "tremendous first quarter," and Clay, a University of Washington student who's traveled throughout Mexico and likes sleeping in hammocks. About half the group has never been in a kayak; the rest generally know how to hold a paddle. One, a veteran whitewater kayaker, even brought his own set of paddles. Also, one of our party is missing; he failed to show up at the Belize City airport in time for the charter flight south. And Jim's luggage never arrived.