The place that i found nice in Cancun was the El Rey Mayan ruins at the 17th km of the hotel zone. There were any iguanas walking around the site, often popped up from a hole in the ruin stones.
There was a great restaurant in Cancun hotel zone called Natura, in front of Senor Frog.
Food was delicious especially the fajitas de pollo. The burritoes were nice too.
El Rey ruins