Public Hot Springs in Southern Cali

We've heard there are hot springs in the area but the only one I've really found online is Agua Caliente in Julian. We're not looking for a spa/massage experience, which is what most of the searches find.

Can you tell me of others in the area?

Is Agua Caliente worth checking out? We've been to hot springs in Colorado and it looked nothing like the pictures on the Agua Caliente page (which looks just like a swimming pool).

Thanks in advance for your help!