My friends and I will be traveling to Cancun in July. While we are staying at an all-inclusive resort, I do not want to only sample a hotel, however nice. I want to see local life and do things besides sit by a pool. Could you good folks rate the following items in terms of time it takes to do/see, if it is worth the time investment, and any other tips/pointers available? 1. Chichen Itza 2. Isla Mujheres 3. SCUBA with whalesharks 4. Cenotes (if there's a particular site, please let me know!) 5. Snorkeling (anywhere, in general) Gracias in advance!!