1. See the Grand Canyon
2. Hike in Oak Creek Canyon in Sedona
3. Eat pizza at the famous Pizzeria Bianco
4. Learn about Indians at the Heard Museum
5. Lowell Observatory in Flagstaff
6. Saguaro National Park near Tucson
7. See birds, animals, and plants of the southwest at Boyce Thompson Arboretum
8. Take a 4-5 hr drive from Phoenix on the Apache Trail
10. Visit The Phoenix Zoo
11. Check out the great art at the Phoenix Art Museum
12. Be a cowboy and experience the wild west at the Rawhide Wild West Town (in Chandler near Phoenix)
13. Learn about desert plants at the Desert Botanical Garden
14. Hike Camelback Mountain in Paradise Valley
15. Visit Tombstone & Bisbee where all the wild west tales really happened and life is a little bit slower
16. Lake Powell (the second largest man made lake in America)
17. Go sailing on Lake Pleasant (closer to Phoenix)
18. Lake Havasu (see London Bridge up close)
19. See the San Xavier del Bac Mission near Tucson (a mission founded in 1692)
20. Montezuma Castle (a day trip from the valley)
21. Havasu Falls (at the bottom of the Grand Canyon but worth the hike) or other waterfalls
22. Pretend you are John Ford filiming in Monument Valley (near four corners)
23. Petrified Forest National Park
24. Picacho Peak (on the way to Tucson you will pass it on the freeway)
25. Hike in the Chiricahua Mountains (The 10,000 foot mountains are in the southeastern corner of Arizona)
26. Kartchner Caverns State Park is 2 1/2 miles of amazing underground caves (near Benson, AZ)
27. Ski Arizona Snowbowl or Sunrise Ski Park
28. Visit Jerome (old copper town)
29. Taste espresso at great coffee shops
30. Eat some great food around Phoenix
31. Cool down at Slide Rock in Sedona (2 hrs north of Phoenix)
32. Hike Squaw Peak (aka Piestewa Peak) in the Phoenix Mountains Preserve
33. Ski at Snowbowl (in Flagstaff) or at Sunrise Park Resort (about 4 hrs from Phoenix)
34. See one of the best preserved meteorite craters on earth (35 miles east of Flagstaff)
35. Go on a balloon ride
36. Skydive over Arizona
37. Tour Frank Lloyd Wright's home in Scottsdale, Taliesin West
38. Take a hike in Arizona! There are tons of resources online for hikers
39. Go to the Grand Canyon Skywalk (if you dare!)
40. Visit one of hundreds of Arizona Heritage Sites
41. Visit Scottsdale. The "Best Run City In The World."
42. See amazing artwork and get shop till you drop in Old Town Scottsdale
43. Eat ice cream at The Sugar Bowl, Scottsdale's oldest ice cream shops (since 1958!)
44. Check out the world's first global Musical Instrument Museum
45. Visit Sunset Crater Volcano National Monument
46. Explore the past at Walnut Canyon National Monument
47. Take a relaxing trip to Greer Arizona
48. See animals from all over the world at the Out of Africa Wildlife Park
49. Take in the beautiful and amazing colors and shapes of Antelope Canyon
50. See the beauty of Canyon de Chelly
51. Do some climbing, hiking, or bouldering on Mt Lemon in Tucson
51. Stop off at the experimental town of Arcosanti
52. The Arizona Sea Life Aquarium has 26,000 square feet of indoor aquarium
53. The Children's Museum of Phoenix is one of the best in the country
54. Take a Jeep tour!
55. Go horseback riding near Saguaro Lake (October though April)
56. Step back into the wild west at Old Tucson Studios
57. Tour Payson Rim Country
58. Taste some great ice cream in Scottsdale
59. Visit Sea Life Aquarium in Tempe
60. Bullhead City has lots to see
61. Have lunch at the Wrigly Mansion (reservation required)
62. Visit the Arizona-Sonora Desert Museum in Tucson
63. The Pima Air and Space Museum is one of southern Arizona's great gems... see old airplanes (Tucson)!
65. The Antelope Canyon is one of the most beautiful things I have seen in my life - a reader
66. River Raft the Colorado River at the Grand Canyon
67. Indian Ruins at Walnut Canyon near Flagstaff
As you can see from the list, Arizona is a mecca for outdoor activities. Despite being known for warm temperatures, Arizona visitors can find fun things to do during all four seasons. However, it's the 300 days of sunshine that often turns temporary visitors into full-time residents. Those interested in moving to Arizona can find houses facing the desert scenery or Phoenix apartments in an up-and-coming metro area.
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Another Great List from Chris Tingom and Tornado Design.