Hey you - learn from my mistakes

This is a two part post, with the followup coming after a little analysis of thist part. This situation may be automatic for some of you, but I have problems playing AA/KK on scary boards.

BB is 30/4/1
No read on MP2

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, <font color="#CC3333">MP2 raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">2 folds</font>, BB calls, UTG calls, <font color="#CC3333">MP2 caps</font>, Hero calls, BB calls, UTG calls.

Flop: (16.50 SB) 5[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">Hero raises</font>, BB calls, UTG folds, MP2 calls.

Turn: (11.25 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">MP2 bets</font>, Hero...?