How do you play this river?

[TheRegulat0r]

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

MP1 ($28.35)
MP2 ($24.80)
MP3 ($22.05)
CO ($23.50)
Button ($33.75)
Hero ($25.20)
BB ($27.30)
UTG ($25)
UTG+1 ($52.37)

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $0.25. Hero posts a blind of $0.10.
UTG calls $0.25, <font color="#666666">2 folds</font>, MP2 calls $0.25, <font color="#666666">3 folds</font>, Hero (poster) completes, BB checks.

Flop: ($1) A[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets $1</font>, BB folds, UTG calls $1, MP2 folds.

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

River: ($11) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Hero?