Traveler’s Notes . . .

Mexico Holidays today begins once-a-week nonstop air service via American Trans Air between LAX and Cancun, Mexico, on Sundays. It is the only scheduled nonstop service between the two cities, a spokeswoman said. The air fare must be bought as a package with car rental (starting at $543 per person for one week) or with lodging. Tel. (800) 448-3333. . . . Cedar Point amusement park in Sandusky, Ohio, this weekend opened what it claims is the world’s tallest roller coaster, the 310-foot-high Millennium Force. (The former titleholder was Japan’s Fujiyama, at 259 feet tall, according to the Guinness World Records 2000 edition.) Tel. (419) 627-2350. . . . The much-ballyhooed “Sue,” the world’s most complete Tyrannosaurus rex skeleton, will be unveiled Wednesday at Chicago’s Field Museum, where it will greet arriving visitors in the Stanley Field Hall. Tel. (312) 922-9410.