This past weekend we stayed at El Dorado Royale in the Riviera Maya, Mexico. Below are pictures showing the current Internet (wifi) prices and sign up details for the resort
The speed was actually good. At first I thought it was worse than a cruise ships in terms of reliability and speed but it turned out that that morning a quarter of the resort was out. Once it was resolved we had no issues as all; in fact we were even able to FaceTime with our son that was home with grandma.
This was information I was interested in before the trip, so I hope it helps you as well.
Related Post: My Review of the El Dorado Royale