The Great Roof is the extremely obvious roof hanging atop Goat Rock. The climb beneath the roof is easy (5.8), yet complicated by the fact that you have a top rope on - you can't go under the rock! Once you're in the large cave, you traverse out the left side, then up towards your top rope anchors.
Hike all the way up around to the back of Goat Rock. There are some rappel bolts on top, from which you rappel down to the proper top rope bolts. The route is overhung enough that you will swing a lot if you fall, but no worries, there's nothing back there.