100nl- Idiot end of a full house

[Nikachu]

Viallain is 20/9/1. What is my best plan on the river? If I bet, how much?

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

BTN: $58.50
SB: $85.70
BB: $147.30
UTG: $116.20
Hero (MP): $102.50
CO: $108.60

Pre-Flop: 9[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $4</font>, CO folds, BTN calls $4, 2 folds

Flop: ($9.50) A[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $7</font>, BTN calls $7

Turn: ($23.50) A[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, BTN checks

River: ($23.50) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero??