Tough river spot

[Hooked]

No reads on villain and no stats on him then this hand came up not sure whats the best way to play this river, comments on all streets are welcomed.
Full Tilt Poker, $0.50/$1 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

CO: $110.65
BTN: $100
SB: $109.95
Hero (BB): $196.65
UTG: $117.80
MP: $100

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] dealt to Hero (BB)
2 folds, CO calls $1, BTN folds, SB calls $0.50, <font color="red">Hero raises to $6</font>, CO calls $5, SB calls $5

Flop: ($18) Q[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $15</font>, CO calls $15, SB folds

Turn: ($48) 7[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $34</font>, CO calls $34

River: ($116) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero?