San Diego Tour: Hop-on Hop-off Trolley. Explore some of the top highlights of San Diego with this one- or two-day pass for the city’s Hop-on, Hop-off Trolley Tour. Choose your own adventure as you get on and off the trolley at any of the 10 included stops, covering famous sights including the Gaslamp Quarter, the San Diego Zoo, USS Midway and the Cruise Ship Terminal, Little Italy, and many more. This San Diego trolley tour also features live commentary from on-board guide during your ride. Book this Special Offer ! San Diego Tour: Hop-on Hop-off Trolley from $39.00