Here's how to get there:
Drive northeast of Flagstaff on US 89 for 12 miles to the Forest Road directly across from the Sunset Crater turnoff. Turn left (west) for about 1/2 mile, turn right (north) on Forest Road 552. Turn right at the Lockett Meadow sign and continue up the very very windy road. You'll know when you get there, because you'll begin to see cars lined up. There's a clearly marked one way loop that runs around the camping area, and you'll be able to find a space if you keep driving. There's a $5 day use fee and you can camp there too, if you'd like. Also, the signs on the drive up specify that the road there is not maintained for passenger cars, and I would have to agree. I did see some smaller cars there, but for the most part it was all 4WD vehicles like ours.
If you go, head out early in the day so you'll have time to make it all the way into the Inner Basin. There and back is about 8 miles, but you can also pick up other trails and go much further. Pack clothing for cold weather- you'll get up to 10,000 feet so it's really chilly and a jacket and hoodie is great for this October weather. We wore our running shoes, but hiking shoes would be best as a lot of it is uphill and rough terrain here and there. You'll also need to bring hiking basics- a backpack full of snacks and/or a lunch, sunscreen, plenty of water, and I also suggest a small blanket to lay on once you arrive at the Inner Basin. It's truly beautiful and my only regret with this day is that we didn't have more time to sit back and take it all in, even more than we did. I can't wait to go back!
Here are some photos from our day: