March

After you have been thinking about the Two-Tone logo for a while, you see the black and white squares everywhere, even when you get your marching orders starting from Union Square...

(As of 2015, subway construction around Union Square makes the start of this puzzle very tricky. No shame in taking a couple of hints to get past that.)

Where you reach the end of the march, this should make sense:

Arabic: 4
Chinese: 3
Dioula: 75
Filipino: 75
Gaelic: 7
Greek: 2
Hebrew: 7
Italian: 20
Japanese: 49
Korean: 8
Spanish: 61
Zulu: 14

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Back

(Not a clue, just a suggestion: If you get tired while walking around, the San Francisco Centre shopping at Market and 5th St has a basement food court; or there are many small coffee shops around, any of which might have a table free.)