Semi-tough river value bet?

[JrJordan]

Villain is very loose passive preflop, but is a mix of calling station, donk bettor, and bluff raiser postflop. We really want to get to showdown vs. this type of player. Versus another player he did smoothcall a flop bet, raise a turn+call a 3bet, and fold the riv. I don't remember the exact board but it wasn't especially drawy.

Party Poker 10/20 Hold'em (6 max, 6 handed) converter

Preflop: Hero is MP with A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, BB calls.

Flop: (4.50 SB) A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, BB calls.

Turn: (3.25 BB) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, BB calls.

River: (5.25 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero...

My kicker got counterfeit, any K is ahead and he would likely go for a c/r here. I get value from an 8, turned Q, or some PP that decided to stick around (not sure if he would call down with a PP lower than 88, we'll assume if he's gotten this far that he will call). I can't fold to a c/r FWIW here.