The two male figures are concrete statues that serve as a bit of decoration and as a popular photography point, as indicated here with the three women cast members and a park photographer.
The description on the back of the card is written in the style of a personal message:
HANDSOME BRADY AND WHISKEY BILL
Knott’s Berry Ghost Town
Buena Park, California
These two old timers are the most photographed characters in Ghost Town, or in any town in the world for that matter. The sign on the wall reads: This Bench is reserved for Handsome Brady and Whiskey Bill & their friends, signed “The Gold Trail Hotel.” The three pretty Calico Saloon Girls are evidently company with a high priority.
— This video explains that the sign, and the postcard, are in error, as the second figure’s name was actually Whiskey Jim, but the park owner never made the effort to correct the sign. This card likely dates from the 1950s.