Party 10+1, AKo, early rounds.

[eniven]

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (10 handed) FTR converter on zerodivide.cx

Hero (t800)
UTG+1 (t800)
UTG+2 (t800)
MP1 (t770)
MP2 (t847)
MP3 (t785)
CO (t808)
Button (t760)
SB (t830)
BB (t800)

Preflop: Hero is UTG with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t50</font>, <font color="#666666">3 folds</font>, MP2 calls t50, <font color="#666666">1 fold</font>, CO calls t50, <font color="#666666">1 fold</font>, SB calls t40, <font color="#666666">1 fold</font>.

Flop: (t212.50) Q[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets t200</font>, MP2 folds, CO calls t200, SB folds.

Turn: (t612.50) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets t200</font>, Hero calls t200.

River: (t1012.50) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ???

Should I have check-raised the turn, or was my check-call ok? What is your play on the river.

Thanks.