Here is what I got today from LocoGringo:
On April 28, the Akumal Beach Resort had a fire which destroyed the main lobby and main restaurant. All the guest rooms are fine, and no one was injured.
The hotel is open and all services are being provided during your upcoming stay. However, you may want to consider other hotel options. A temporary lobby has been established where their older lobby once was and two other restaurants are where all the meals are being serviced. During your stay there may be reconstruction occurring. We do not have specifics or a time schedule of the work that is going to be done at this time. That being the case you may want to consider a different resort.