Most Foursquare specials are weaker than a free topping on a frozen yogurt. But a certain few make it worth the extra trip.

Medicine Agency
At this gallery the Mayor gets a free “Dodgers Suck” T-shirt. It doesn’t get better than that.
1262 Mason St., 415-829-8615, medicineagency.com

Broken Record
The mayor gets a free shot of Jack Daniels or Jameson at this Excelsior nightspot.
1166 Geneva Ave., 415-963-1713, brokenrecordsf.com

Church Key
Anyone who checks in gets 50 percent off their order, while the mayor drinks free “mystery beer” all night.
1402 Grant Ave., 
415-963-1713

Shotwell's
The mayor gets his or her own seat and VIP service. Everyone who checks in gets $1 off taps on Sunday.
3349 20th St., 415-648-4104, shotwellsbar.com

Show Dogs
The mayor’s first beer is free.
1020 Market St., 415-558-9560, showdogssf.com

YBCA
Anyone who checks in gets free gallery admission, $2 off films and $5 off performances. The mayor treats a friend.
701 Mission St., 415-978-2700, ybca.org

Marsh Café
Check in and get $2 off the ticket price; the mayor gets a free drink.
1070 Valencia St., themarsh.org/cafe