400: AA Considering Turn Check

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Full Tilt No-Limit Hold'em, $4 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

MP2 ($396)
Hero ($506.30)
CO ($173.30)
Button ($211.30)
SB ($396)
BB ($385)
UTG ($392)
UTG+1 ($399.35)
MP1 ($383.10)

Preflop: Hero is MP3 with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls $4, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $18</font>, <font color="#666666">1 fold</font>, Button calls $18, <font color="#666666">2 folds</font>, UTG+1 folds.

Flop: ($46) 5[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $30</font>, Button calls $30.

Turn: ($106) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>


Villain is tag, but a hair passive really. Seems pretty obvious he has a pair here. Even tho, he's passive, I may induce a bet here or a river call. However, I hate giving free cards...even if it's only 2 outs. And, there can be plenty of overs to his 7s or whatever that scare him anyway.

Thoughts?