There are only 4 Boutique beach hotels on the Yucatan Peninsula. Why? Because Mexican Boutique hotels are carefully chosen for their unique style and privileged location. Not to mention that they offer only the best of the best for the discerned traveler like you. Supreme service by people who attend to your every whim and pamper you with outstanding Mexican hospitality and comfort.
Mexico is a country where many things can be bought, but be assured the screening for Mexico Boutique Hotels is not one of them. Every possible detail is taken into consideration, even the thread count of the sheets. You'd sooner get into Fort Knox!
Here is my little list:
CasaSandra on Holbox Island
Xaloc on Holbox Island
Secreto on Isla Mujeres
The Tides-Riviera Maya at Playa Xcalacoco, about 10km to the north of Playa del Carmen. (Formerly Ikal del Mar)
Each of these Yucatan guest houses has it's own distinctive character, but all offer intimacy, tranquility and poetic settings. The use of natural materials for building and furnishing makes it possible to maintain balance between your want and the already stressed environment. That's why I think this type of small luxury hotels are a delightful bliss compared to large resorts with 2,000 rooms or more.
My recommendation? Try all four of them!