During March 1995 Sun Line’s Stella Solaris will be departing Galveston for the Yucatán and parts south (800-872-6400). This time the special equinox cruise has been expanded to include sites in Honduras and Guatemala. Other cruise lines, such as Regency Cruises (212-972-4499) and OdessAmerica (800-221-3254) (interestingly, a Ukrainian line), offer similar trips. When you select a particular cruise, keep in mind that most shore excursions into Maya country involve long bus rides and even travel by plane, and as enticing as they all appear, two twelve-hour jaunts back to back might be one too many.