The San Diego Wild Animal Park had a monorail, which they have removed. They replaced it with a fleet of Chance Tramstars that traverse a much truncated route. They also have a Chance Endangered Species Carousel with the faux thatched roof and scenery, IMHO other than the figures it's fugly. Then there is the tethered helium balloon ride over the park.
The Zoo itself (in Balboa Park ) has the skyway, double decker bus tour, and outside the gate the miniature train ride. The latter is one of the Swope Railways installations dating back to the late 1940's, still running with the Minature Railroad Co. trains. By the way all of the aforementioned attractions are upcharges.
Also just outside the gate is a 1910 Herschell-Spillman three abreast menagerie carousel, which is privately owned. It only operates (per it's lease with the city) on weekends and when the city schools are out of session. *** Edited 7/13/2008 5:54:49 PM UTC by Dutchman***