A destination-by-destination guide to the best romantic getaways in Mexico for 2026, with where to stay in each: Los Cabos (One&Only Palmilla, Las Ventanas al Paraíso), Tulum (La Valise), colonial San Miguel de Allende (Rosewood), the Riviera Nayarit near Punta Mita (Naviva, Four Seasons), the Riviera Maya (Rosewood Mayakoba, Maroma, Chablé), car-free Isla Holbox, and Bacalar's Lake of Seven Colors. Each covers why it's romantic, named places to stay, what not to miss, and when to go for couples.