We will be in San Diego area in July staying in Ramona. My 6 and 9 year old boys desperately want to pan for gold. I have found a couple of places in Julian area, but it looks like you buy a bag of "stuff" and pan it. We want to really pan in a creek or something more authentic feeling. We do not mind driving a couple hours if worth it. Any public gold mining areas or somewhere to pay admission for a day? Thanks!