The 777-room Aventura Spa Palace is an all-inclusive mega-resort in family-friendly Puerto Aventuras. The hotel -- a step above most all-inclusives, with four good restaurants and four pools -- is a quiet, adults-only retreat. (The Cove Palace next door is the family-friendly option). Spread across 85 acres, the Aventura features a massive, beautiful spa, a large fitness center, tennis courts, a rock climbing wall, and modern rooms with flat-screen TVs, marble bathrooms, and sexy Jacuzzi tubs in the center of the room. One downside is that the hotel does not have standard beach access -- sandy lagoons are protected by rock formations from the rough surf -- but access to other Palace resorts beaches, such as the Playacar Palace in Playa Del Carmen, is free.