Like smashing a snow globe against your forehead, tours can open up a fascinating new world right before your eyes. Go beyond the surface with this Groupon.

Choose Between Two Options

• $20 for a 90-minute sunset cruise for two on a Friday (up to a $40 value)
$20 for the above on a Saturday (up to a $40 value)

Sunset cruises take passengers on a leisurely jaunt through the bay, gliding past Angel Island, Belvedere, Sausalito, and the Golden Gate Bridge as the sunset paints them rosy colors. Passengers are encouraged to bring their own dinner for picnics, which can be spread out on tables inside or outside. Each cruise departs at 6:30 p.m. and returns to the dock at 8 p.m. Sunset cruises are available until October 13; the ferry does not run a Saturday night cruise on August 4.

Angel Island Tiburon Ferry

Departing from the charming town of Tiburon, the Angel Island Tiburon Ferry takes passengers on 10-minute rides to the historic Angel Island State Park. The ferry is run by the McDonogh family, which boasts a storied history of five generations of running boats to the island while quoting lines from The Adventures of Huckleberry Finn. The company runs its route year-round, encouraging hikers and bicyclists to take advantage of the islands’ trails in any season and also runs regular sightseeing cruises around the bay. Passengers can embark on one- to two-hour excursions that glide beneath the Golden Gate Bridge, explore Alcatraz, or cruise along the shoreline of Marin County.