Plenty of bars/lounges in that area, all within walking distance:
The Matrix, The Balboa Cafe, Eastside West, City Tavern, Triangle Lounge, Hi-Fi, Cozmo's, Mauna Loa, Gravity Room, Comet Club, Bar None, Blue Light, La Barca's, Silver Cloud
Most of these are bar/restaraunt type places, so most of them have no cover charge, and there is lots of street game as well because of all the foot traffic from people walking from place to place.
Good F/M ratio too - probably 50/50 and a majority of the girls are hot.
The age group is generlly 21-30, but that depends on the venue.
Weekends are best, but Thursday nights are good too, but it tends to die out around Midnight.