AQs in BB L:1 50+5

[TheUsher]

I realized I played this very passively but something just seemed very wrong with the bets. I thought I'd be ahead but the cold-caller and the original raiser betting on every street puzzled me. Note the exact bet to put me all-in on the river. Any other way to play it? Check/raise the flop perhaps? It would be at least half my stack if not all-in if this option was chosen though, right? Bet the flop into the raiser?

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) converter

UTG+1 (t905)
UTG+2 (t1000)
MP1 (t925)
MP2 (t1395)
MP3 (t1340)
CO (t770)
Button (t895)
SB (t640)
Hero (t1000)
UTG (t1130)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img].
UTG calls t15, UTG+1 calls t15, <font color="#666666">2 folds</font>, MP2 calls t15, <font color="#CC3333">MP3 raises to t30</font>, <font color="#666666">1 fold</font>, Button calls t30, SB calls t20, Hero calls t15, UTG calls t15, UTG+1 calls t15, MP2 calls t15.

Flop: (t207.50) Q[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(7 players)</font>
SB checks, Hero checks, UTG checks, UTG+1 checks, MP2 checks, <font color="#CC3333">MP3 bets t150</font>, Button calls t150, SB folds, Hero calls t150, UTG folds, UTG+1 folds, MP2 folds.

Turn: (t657.50) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets t250</font>, Button calls t250, Hero calls t250.

River: (t1407.50) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets t570</font>, Hero folds.

River action actually should include button calling the all-in but converter messed it up.

Final Pot: t1977.50

Results in white below: <font color="#FFFFFF">
MP3 has 8c Kc (straight, nine high).
Button has 8s 7s (flush, queen high).
Outcome: MP3 wins t1407.50. Button wins t570. </font>