7-handed, C/R middle-pair weak-kicker

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is SB with 5[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, UTG+2 calls, MP1 calls, MP2 calls, MP3 calls, <font color="#666666">2 folds</font>, Hero completes, BB checks.

Flop: (7 SB) A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(7 players)</font>
Hero checks, BB checks, UTG+1 checks, UTG+2 checks, <font color="#CC3333">MP1 bets</font>, MP2 calls, MP3 folds, <font color="#CC3333">Hero raises</font>, BB folds, UTG+1 folds, UTG+2 folds, MP1 calls, MP2 folds.

Turn: (6 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>...


Just started at the table, so no reads on the players.

Everyone checked to someone in relatively late position and he bet - doesn't mean much. The pot was fairly large, so I was given 9:1 on my call, which is more than the 8:1 I needed. I certainly wasn't folding!

There were many people to act after me, the pot was large, the bettor could have crap, and I can represent a much stronger hand. All of those together tell me I should be raising and making people face two-bets cold.

When it became heads-up on the turn, I kept up with the aggression. If he raised me here, I'd fold.

Anyone think I should have played this differently?

If he calls the turn, what's your line on the river when you don't improve? Bet/fold? Check/fold?