If you want a lovely setting but can deal with a complete lack of courtesy and class, not a bad place to stay.
Diamond K is a strikingly lovely beachside hotel set on one of Tulum’s many secluded bays. Set among palm trees and lava rock, the cabañas are well maintained, the restrooms quite clean, and the restaurant serves decent, if not somewhat overpriced food. The hotel—when compared to other rustic cabana options down the beach—is very reasonably priced, and doesn't seem to raise their rates much for high season. However...
We first stayed here in July of 2006, before Hurricane Dean and an assumed change in either the management or ownership, and though we recall a bit of odd managerial behavior—one woman seemed to control everything and be the go-to about money--we felt overall folks were pretty friendly. This time, however, was an unexpected change. We arrived at 9:30 pm and were confronted by the night clerk who, through a cloud of pot smoke, peaked at us contemptuously over the rim of her eyeglasses. At first she was unable to find our reservation, even though we had an email less then 36 hours old confirming our room. Once she did find it written in her book, she berated us for several minutes about not bringing a printed copy of our Paypal receipt "for their records". She informed us that it was common practice along the beach and required before she would give us our room. “I have been here for 20 years, and everywhere on the beach it’s the same.” (apparently she hasn’t checked in with Cabanas Copal, Papaya Playa, Luna Maya, Piedra Escondida, or Cabanas La Luna, none of whom asked us or our wedding guests for a receipt or proof of reservation). She insisted that this requirement was plainly noted on the hotel’s website and on the Paypal reciept. It turns out that that is not the case at all (a subsequent review and careful reading of the receipt and all correspondence with the hotel failed to find any mention of the afore mentioned requirement). We were only allowed our room after showing her a copy of the Paypal email still in my inbox on my laptop, which I just happened to have brought along. Thinking this might be a one-time deal, we relaxed.
However, we’d recommended the hotel to a number of our wedding guests, including my wife’s sister (thank God she was the only one that took us up on the suggestion). When she and her sister went to check in to Diamante, the same woman was there in the morning, the exact same hard time given. This time, my wife lost her cool and brought up some issues of payment clarity and guest courtesy, to which the woman said, “I understand you’re tired, Madame” to which my wife about collapsed in shock. When she protested, the clerk only proceeded to argue louder over her. So much for the customer is always right theory. At least the customer deserves some decency.
We find it odd that a hotel that offered online reservations and payment, would not themselves have the ability, to say nothing for a computer, to communicate with each other regarding reservations. We are baffled as to why the woman handling the reservations and the clerk at the front desk can't share information from Paypal...?
Our only other complaint comes from knowing better. We've been traveling and living in Mexico now for close to seven months and are well acquainted with what is commonly known as "the gringo" price. For those not well versed it's, on average, 10-15% higher than what locals pay. What we are not accustomed to is what we started calling the "revolving/evolving/fluctuating gringo price." We encountered this phenomena at the hotel bar. There is the "money mama", who handles all the cash, this too is a common practice here in Mexico. What is uncommon, however, is that she also controls the price of selected menu items. Over the three days we stayed we ordered a small assortment of the same drinks. I offer a glass of wine, white Mexican, to be specific. We again ordered the same wine, poured from the same bottle, often by the same bartender, yet paid a varying price. Here's how it would go down; we'd order, the barman would pour, we'd offer up the previous price paid, the batman would look to the money mama, and she would, it seems look us over, and based on some unknown criteria or mood, decide on a new and different price for that day or drink (a Michelada went from a consistent 30 pesos, to 45 with money mama). After the second day we started offering up the going average gringo rate and refused to pay more, which was met by the somewhat apologetic barmen who still refused.
Positives: the rooms are great, the views fantastic, the atmosphere mellow, and several of the employees super fantastic. Negatives: the prices vary on the spot, the service is spotty, and the management is lousy.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC