They say go where the locals are...historic downtown is certainly that hub of activity offering an abundance of must-do activities including self-guided walking tours, restaurants, attractions, brewery trail, art galleries, boutiques, outdoor outfitters, breweries...let's just say downtown is an itinerary must. (I definitely copy pasted that, but you get the point).
An abandoned ghost town on the highway between Flagstaff and Winslow, roughly a 45 minute drive one way. Here you can explore the Apache Death Caves, remnants of an old zoo built in the 1920's, a former, burned down pit stop including a gas station and a now graffiti filled swimming pool. It's one of Cora's family's favorite places to go and take visitors, but make sure you're being careful and respectful of any ruins left behind.
If you're up for a challenge, consider hiking Mt. Humphreys. It is the highest mountain in the state of Arizona, with an elevation of 12,637 feet. The trail itself is just over 10 miles long and gains more than 3,000 feet in elevation, but the views of the San Fransisco Peaks at the summit are absolutely phenomenal.