I lost a ring at the beach a while back and I was wondering if I could metal detect and try to find it? Thanks for your help

There are no rules or laws that says you can't use a metal detector go for it

Yes as long as you're not on a staked claim. You cannot however pan for gold.

Theres no reason not to

Worse case scenario they ask you to stop. I'd say go for it

Good luck!

Don't see why not.