What to do on this turn donk-bet?

[veganmav]

I have 10 hands on UTG+1 and have been in another hand with him already where he played super agressive and I assume missed a draw on the river. His stats after 10 hands are 60/2.0/40. Seems very likely that he is your standard Maniacal LAG.
He has sucked out with junk twice already that I have seen at this table.

Party Poker 15/30 Hold'em (10 handed) converter

Preflop: Hero is MP1 with Q[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises</font>, UTG+1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">4 folds</font>, SB calls, BB calls, UTG calls, UTG+1 calls.

Flop: (15 SB) 3[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, UTG+1 checks, <font color="#CC3333">Hero bets</font>, SB folds, BB folds, UTG folds, UTG+1 calls.

Turn: (8.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG+1 bets</font>, Hero...?


On this Turn when he donk bets me I think he could have anything. He could have a flush, a straight, two pair, one pair, a King, Ace high, a draw or a total bluff.
I thought about raising but since he is so aggro, I really don't want to get 3-bet because if I fold I could be folding the best hand to a semi-bluff and it's definately a tough spot to call. On the otherhand, he could be on the straight draw or nut flush draw in which I would want to charge him as much as possible. I was really stuck on this turn donk bet. I think he could 3-bet me with anthing from the nut flush all the way down to a pure bluff.

I think it's likely that he doesn't have the, not only because he'll play any2, but more importantly, he is very agressive, and would have raised the flop, or check-raised this turn instead of donk-betting it.

But still, does anyone have a better line for me from this turn card?

[geormiet]

Just call it down, bet the river if he checks. I don't even think a player read would change how i played this hand, it seems very standard.