Honanki and Palatki Indian Ruins are interesting.
Schnebly Hill Vista Overlook has a great view, but you either need to hike up it or have a high clearance vehicle.
The red rocks around the Broken Arrow Trail are cool.
Sunset crater near Flagstaff
Drive up to Snowbowl
The lava tubes are fun
If you are into the stars, Lowell Observatory is interesting.
Shultz Pass road is a fun drive.