What? : Arizona considered to be a desert state and the first thing come in mind is the Grand Canyon but actually it has many more thing to offer.
The main cities in Arizona are Flagstaff, Page & Sedona at the north, Phoenix in the middle and Tucson at the southern part. You can plan your trip by using each one as a basecamp for few days, discover the city and the nearby location as day trip.
When? : Preferred visiting time is not at the hot summer months where temperatures are usually above 100f.
Due note 1: When planning a trip to Arizona this is usually combined with other locations like Las Vegas and probably even California from the west, Utah from the north, and maybe New-Mexico and Colorado from the east.
Due note 2: Visiting Arizona during winter month is good option but do remember that the northern part (Flagstaff) can have cold weather and snowstorms so take this into considerations.
Due note 2: I did not cover many local attractions the state of Arizona and the city of Phoenix has to offer (like Golf, museums and other nature attractions that can be more appropriate to people living in Arizona).
More blogs on Arizona:
Lone Rock Beach NRA
White Pocket Arizona
Monument Valley NP
The road from Las Vegas (NV) to the Grand Canyon (AZ)
Grand Canyon - South Rim
Chiricahua National Monument
Saguaro National Park
Tucson and South Arizona