Trip to Mexico

I’m planning to do the trip on April. At the time of the year weather is not too hot for European tourists, but it's still good for swimming in sea, diving or just lying on a sandy beach. The plan is to fly to Mexico City and then rent a car or using a coach travel to Cancun stopping for 2-3 days in small cities, visiting pyramids of Maya, enjoying nature and Mexican food. I’m with excitement searching in Internet for a best trip option and planning the whole route.