Alcatraz Prison Tours
http://www.inside-guide-to-san-francisco-tourism.com/alcatraz-prison-tours.html
 
Cable Cars (catch one right in front of the Omni Hotel)
https://www.sfmta.com/getting-around/transit/how-ride/how-to-cable-cars
Adult fare is $7.00. Information on fares, transfers, day passes, and routes is available on the website.
 
Chinatown
http://www.sanfranciscochinatown.com/
San Francisco Chinatown is the largest Chinatown outside of Asia, as well as the oldest Chinatown in North America. Known for its shops and restaurants, it is the most densely populated area west of Manhattan with some 15,000 residents living in 20 square blocks.

Golden Gate Bridge
http://goldengatebridge.org/research/facts.php#GGBOpened
The bridge can be seen from Pier 39 (provided there's no fog). Sail under the bridge on a bay cruise or take a San Francisco City Tour to vista point (see Gray Line Tours).

Gray Line Tours
https://graylineofsanfrancisco.com/tour-search/
The San Francisco City Tour ($62), San Francisco City Tour and Bay Cruise ($91), and the San Francisco City Loop Hop-On, Hop-Off 24-Hour Pass ($48) are comprehensive tours at a good value.
 
Gumps Department Store (0.4 miles from the Omni Hotel)
135 Post Street (off Union Square)
http://www.gumps.com/about-us/our-history
Gumps is to San Francisco what Harrod's is to London. If you visit Union Square, don't miss this unique 150-year-old department store!

Museum of Modern Art (0.6 miles from the Omni Hotel)
151 Third Street
https://www.sfmoma.org/
Visit the recently expanded museum. Adult tickets are $25 and may be purchased online.
 
Pier 39 and Fisherman's Wharf (accessible by cable car)
https://www.pier39.com/   http://www.fishermanswharf.org/home.html
Hours are 10:00 a.m. to 10:00 p.m. Visit the website for a list of shops and restaurants. Be sure to see the sea lions who make Pier 39 their home! Catch the boat for a bay cruise or Alcatraz tour next door at Pier 43.
 
Union Square Shopping District (0.6 miles from the Omni Hotel)
http://unionsquareshop.com/
The Square itself is home to Macy's, Saks 5th Avenue, Nieman Marcus, and Tiffany, to name a few. The side streets house Gumps, Coach, GAP, Gucci, Hermes, Ralph Lauren, Levi's, Louis Vuitton, The Disney Store, Emporio Armani, and many more. Visit the website for a map and an alphabetical list of stores.
 
Westfield Center (0.7 miles from the Omni Hotel)
865 Market Street
https://www.westfield.com/sanfrancisco
This 9-story mall with 170 shops and restaurants is open from 10:00 a.m. to 8:30 p.m.