I have AA, the board is ugly and I face a small riverbet

Opp seems like a bad lagg (read: donk), both pre- and postflop.

Party Poker No-Limit Hold'em, $ Hero (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($19.38)
Hero ($99.50)
UTG ($97.81)
MP ($54)
Button ($92.82)

Preflop: Hero is BB with Ahttp://www.flopturnriver.com/phpBB2/...iles/heart.gif, Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif. SB posts a blind of $0.50.
1 fold, MP calls $1, Button calls $1, SB (poster) completes, Hero raises to $4, MP folds, Button calls $4, SB folds.

Flop: ($12) 8http://www.flopturnriver.com/phpBB2/...iles/spade.gif, 6http://www.flopturnriver.com/phpBB2/...iles/spade.gif, 6http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero bets $9, Button calls $9.

Turn: ($30) Thttp://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero bets $22, Button calls $22.

River: ($74) Thttp://www.flopturnriver.com/phpBB2/...iles/spade.gif (2 players)
Hero checks, Button bets $31, Hero calls $31.

Final Pot: $136

shitty, but for the price, you can't beat a call.

I raise more preflop due to my position, but probably only by $1 or $2.

I pot the flop. If hes got a flush draw he's calling anyway, and pretty much everything else barring 88, or a 6 (Which he probably doesnt have) should fold.

I agree that I would probably raise to $5 or $6. Yes, you want action but you don't enjoy playing out of position. That flop is a great flop for you and sometimes I would even overbet this flop not so much to protect my hand but to commit myself for the turn bet. I want him to have to put up a significant amount on the turnto chase and make missing +EV for me. Very bad card on the end but at worst he couldve called you down with 8x.

try to raise more preflop, i also bet closer to the pot on turn, river is fine