More about it:

"Peralta Playland (1950 – 1968) was a small amusement park along the channel between Lake Merritt and the estuary next to the Kaiser Convention Center. It included a miniature steam train called the Oakland Acorn, a paddle boat called Lil’ Belle [sic], a rocketship simulator called the Star Flyer, and various permanent rides, as well as seasonal attractions like pony rides. Other rides included Bulgy the Whale, the Kiddie Ferris Wheel and the Circus Carousel. A 1953 article says attendance in 1952 was approximately 450,000 people over the year." -- [localwiki.org], [localwiki.org]