$55: A2 on A669 board and checked to me after my pot raise on flop

[AA suited]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

MP2 (t1000)
MP3 (t820)
CO (t730)
HERO (t850)
SB (t940)
BB (t2080)
UTG (t1455)
UTG+1 (t605)
MP1 (t1520)

Preflop: HERO is Button with A[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img].
UTG calls t30, UTG+1 calls t30, <font color="#666666">1 fold</font>, MP2 calls t30, <font color="#666666">2 folds</font>, HERO calls t30, <font color="#666666">1 fold</font>, BB checks.

Flop: (t165) A[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, UTG checks, <font color="#CC3333">UTG+1 bets t50</font>, MP2 folds, <font color="#CC3333">HERO raises to t165</font>, BB folds, UTG folds, UTG+1 calls t115.

Turn: (t495) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+1 checks, <font color="#CC3333">HERO ???
<font color="black">
no reads.

i read his weak flop bet as a pocket pair. when he called my pot raise, he might have a Ace.

check on the turn, and check/fold to a medium bet if the river card is smaller than a 9? if larger than a 9, check/call since it might be a split pot?

what's the correct play on the turn + river, and why? </font>