I went to Cancun a some time ago.
My best friend just came back from there last month.
Cancun might as well be in GB or US. Most speak English and safety is very highly regarded out there. The whole local economy is based on tourism so that place better be safe.
The airport is a tad small, but manageable. Its about 25-30min bus ride to the main resort areas. More if you're renting a place outside of main strip somewhere.