Attempting to trap loose maniac - call river?

[FreakDaddy]

Villian plays a lot of hands and is quite aggressive and a bit reckless at times. He's gotten fairly lucky so far though from my observations. He bets at a lot of pots whether he hits them or not. Would you take a different line? Call the river?
Party Poker No-Limit Hold'em, $ BB (9 handed) converter

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

MP2 ($146.05)
<font color="#C00000">MP3 ($167.85)</font>
CO ($56.60)
Button ($85.95)
SB ($91)
<font color="#C00000">BB ($75.35)</font>
<font color="#C00000">Hero ($98.50)</font>
UTG+1 ($91.20)
MP1 ($70.35)

Preflop: Hero is UTG with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.50. Hero posts a blind of $1.
<font color="#666666">1 fold</font>, MP1 calls $1, MP2 calls $1, MP3 calls $1, CO calls $1, <font color="#666666">2 folds</font>, Hero (poster) checks.

Flop: ($5.50) 4[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
Hero checks, MP1 checks, MP2 checks, <font color="#CC3333">MP3 bets $2</font>, CO folds, Hero calls $2, MP1 folds, MP2 folds.

Turn: ($9.50) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets $2</font>, <font color="#CC3333">Hero raises to $6</font>, <font color="#CC3333">MP3 raises to $10</font>, Hero calls $4.

River: ($29.50) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP3 bets $20</font>, Hero??