Champ, I see nothing there that says "metal detecting allowed". It simply telling you things that are prohibited. Hmmm, so here's what you need to do: Go to Santa Monica city hall and ask permission (can't be too safe after all). Give them a contract to sign. Be sure to use words like "dig", "take/remove", "lawsuit", "legal" and "indian bone" during your request . So that they have the full implications of your request. Then report back to the forum on whether it's allowed or not.
Also I see from the list of prohibitions that you might be S.O.L. anyhow. It forbids nudity (undressing). We know that you detect in the nude, so I guess this precludes you from the git-go