No Hyatts in Rio. All the "beachfront" hotels face a road that seperates the beach from the buildings. I didn't see any hotels I would descirbe as Hyatt standard, but I only stayed there twice, at Copacabana. Overall, I found the place dirty and highly overated. I also was always worried about my personal security.
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United UGS, MM
Hyatt Lifetime Diamond
Starwood Platimun