What skill level would you say this hike is? Beginner,moderate, or advanced?

I would say it's advanced. If you're going to the waterfall. It's a little over 7 miles round-trip if you take the creek trail. The last mile has some large bouldering that will require some upper body strength.

If you want to go to the waterfall is advanced

Moderate to Advanced

Moderate

Moderate in the spring and winter, advanced in the summer, don't do it in the summer unless you have plenty of water (about 4 water bottles worth it can get super hot out there) and wear sunscreen or bring a hat.