A city is a place of tremendous variety, usually constructed upon rock ‘n’ roll. Plumb the secret depths of your city with today's Groupon: for $27, you get a San Diego Old Town trolley tour and a seal tour (a $54 value) from Old Town Trolley Tours of San Diego.

Old Town Trolley Tours take viewfinders on extensive, fully narrated tours of San Diego's lively landmarks and a hundred individual points of interest. With this deal, you get admission to two separate tours:

• The San Diego Old Town trolley tour is a two-hour daytime excursion that takes travelers past more than 100 points of interest and has 11 convenient stops to either hop on or off the trolley for up-close exploration at foot speed. Patrons can gaze upon the Victorian-themed architecture of the Gaslamp Quarter, stop in for retail adventures in Seaport Village, or bask in the idyllic green of Balboa Park. Tours are conducted by eloquent guides who engage tourgoers with captivating tales as the tour rolls past the San Diego Zoo, the San Diego Museum of Art, and Mount Fuji, which is currently on loan from Japan.

• The Seal tour provides a unique view of the skyline from San Diego's Big Bay on a 90-minute land-and-maritime adventure. The amphibious Hydra-Terra vehicles, which are named after the Greek creature that sprouted extra heads to share sightseeing experiences with, departs from Seaport Village and travels along the coast as a tour guide tells fascinating stories about the early sailors that worked the 14-mile bay. These vessels will then drive directly into the water around Shelter Island to sail alongside Navy ships and tugboats. Aqua-tourists may even spot a California Brown Pelican, a Blue Heron, or a sea lion if they are willing to lure them by singing the sea lion national anthem.

Reviews

More than 160 TripAdvisors give Old Town Trolley Tours 4.5 owl eyes, and Yelpers give it four stars:

• It is the only way to see San Diego. – Teacher53227, TripAdvisor
• The Old Town Trolley Company's employees are friendly, courteous, and wonderful ambassadors of San Diego! – LoveOurCity, TripAdvisor
• I'm even from San Diego, and this trolley took me to places I never even knew existed! – Aaron T., Yelp