BB special. What's my river plan?

[witeknite]

Villian was 20/0 and moderate agg. after 20 hands. Not sure if I should check/call, bet/call, or bet fold this river.

Party Poker 5/10 Hold'em (10 handed) converter

Preflop: Hero is BB with 6[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">5 folds</font>, MP3 calls, <font color="#666666">1 fold</font>, Button calls, SB completes, Hero checks.

Flop: (4 SB) 6[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP3 calls, Button folds, SB folds.

Turn: (3 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP3 calls.

River: (9 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero...

Final Pot: 13 BB

[Gravy (Gravy Smoothie)]

No read? Bets and calls a raise.