From SFWiki

The Esmeralda Street Slide is a tandem, metal slide. It is located next to the long staircase that climbs the west side of Bernal Hill. The top of the slide is at the intersection of Esmeralda and Winfield. Go there with your friends and race!

Unlike the Seward Street Slide, this slide is made of metal. So, you should be able go down without any special aids (like cardboard or wax paper).