Red Rock is a small, starkly beautiful island a few hundred m South of the Richmond-San Rafael Bridge. It's about 200 m in diameter but 100 m high, and is indeed dark red in color.
On this trip you will be in the middle of a large part of the Bay, with a fetch of several miles to the North and to the South. Even a breeze can generate considerable chop here, so you will want a calm day. It will be easiest if you leave the OWRC near the end of a flood so you round Red Rock at slack and can ride the ebb back. The currents here are 1-2 hours later than at the Golden Gate.
Row through Raccoon Strait and turn to the North at Bluff Pt., marked by the shore pylon green "5". The shipping lane starts close to the shore, but you have good visibility in both directions. The high speed ferries that run between San Francisco and Larkspur are the biggest danger, and they sometimes travel close to the shore. If you go with another rower there will be two people to look for other boats and a bigger target for them to see you.
After about a mile the coast turns sharply to the West at Pt. Chauncey, marked by the shore pylon green "9". The Romberg Tiburon Center, which is the SF State University marine field station, is a conspicuous group of buildings here. This is a good place to turn North and quickly cross the shipping lane. It's only about a half a mile wide, and you will know you are out of it when you pass buoy red "10". You micht also look for the red-white buoy "B" that marks the middle of the channel. After passing red "10" row straight for the island, which will be clearly visible. There shouldn't be any ships now because the the tankers that dock at the Richmond Long Wharf use the narrow channel along Southhampton Shoal (but always keep an eye out for tugs, barges, etc.).
After rounding Red Rock you can return along the same route.