Mexico's gorgeous beaches, ancient ruins, verdant jungles and vibrant cities have long enticed international tourists. These days, a wide selection of exceptional hotels adds to the country's attractions. After a day spent exploring Mayan pyramids, hiking through a rainforest or just savoring the sun and some margaritas, guests can unwind at a high-end chain, boutique or independent hotel — all featuring luxury accommodations, exemplary service and fine dining. From the Gulf of Mexico to the Pacific Ocean, here are our selections for the best places to stay south of the border.