Two pair hand, board is draw heavy by the river

[Jeff P]

Opponent in this hand is very loose (67%vpip after 55 hands) and passive (0%pfr, avg. aggression 0%). I probably should have raised this pre-flop, but that's another point. How would you handle the river?

Party Poker 0.5/1 Hold'em (9 handed) converter

Preflop: Hero is UTG with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
Hero calls, <font color="#666666">4 folds</font>, CO calls, Button calls, <font color="#666666">1 fold</font>, BB checks.

Flop: (4.50 SB) 9[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, CO calls, Button folds, BB folds.

Turn: (3.25 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls.

River: (5.25 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero calls.

Final Pot: 7.25 BB

[aK13]

Preflop raise should be automatic.

I bet the river, as I think he could be calling you down with an A that you have dominated. If he raises, I call, as I don't give him credit for a T and I think he could be raising with a weaker 2 pair often enough.

[Jacob_Gilliam]

Whats there to say? Call and hope he doesnt have a straight. Not a good place to go for a raise.

[Jeff P]

I couldn't decide if I should bet out or just check/call. I wasn't inclined to fold this on the river, so I opted for check/call. Is that too weak? Should I have bet/called?

Thanks.