100nl: TPGK on awkward board

[Nikachu]

I just sat down a hand ago. I don't know anything about Villain but his PF limp suggests that he cannot be great.

What is my plan on this river?

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

Hero (SB): $99
BB: $100
UTG: $116.50
MP: $75
CO: $97.45
BTN: $75.10

Pre-Flop: J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] dealt to Hero (SB)
2 folds, CO calls $1, BTN calls $1, <font color="red">Hero raises to $6</font>, BB folds, CO calls $5, BTN folds

Flop: ($14) 8[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $11</font>, CO calls $11

Turn: ($36) T[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $28</font>, CO calls $28

River: ($92) 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero ?