For statewide travel information, contact the Arizona Office of Tourism (tel. 602/364-3700; https://tourism.az.gov). Nearly every city and town in Arizona has a tourism office or a chamber of commerce that can also provide information.
If you want to load up your smart phone with Arizona-specific apps, I recommend the following. For news and entertainment/event information go to www.azcentral.com (the website for the Arizona Republic, Phoenix's daily newspaper). For making restaurant reservations, the OpenTable app, available from the iTunes app store, is invaluable.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.