Decision time on the turn - do i fold 2 pair?

Be really interested on what you think of my play here - especially what you would do on the turn.

UTG was fishy - 33/2/0.5 - 270 hands
MP3 was average at best 16/6/1.6 - 560 hands


Party Poker 5/10 Hold'em (10 handed) converter

Preflop: Hero is BB with 5[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">1 fold</font>, Hero calls, <font color="#CC3333">UTG+1 3-bets</font>, <font color="#CC3333">MP3 caps</font>, Button calls, Hero calls, UTG+1 calls.

Flop: (16.40 SB) T[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG+1 raises</font>, <font color="#CC3333">MP3 3-bets</font>, Button folds, Hero calls, <font color="#CC3333">UTG+1 caps</font>, MP3 calls, Hero calls.

Turn: (14.20 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG+1 bets</font>, <font color="#CC3333">MP3 raises</font>, Hero ?