King or milk snake. Scarlet milk snake also. One and only encounter for me. Kind of a rare find I was told. Another cool rare snake is the green tree snake. I've seen twice.
@DrippingPink: Yeah, you're right, super rare to find in the wild. I was an amateur herpetologist for a number of years and searched for all kinds of reptiles...never seen one in the wild. I was lucky enough to see an Arizona Mountain King once at Mount Lemmon in Tucson...