boat fold from a SH rookie

[DCWildcat]

I'm a grizzled veteran of full ring, but I've only logged about 3k hands in 6-max, and although my stats are pretty good, i'm still feeling pretty rough.

Hand 1. Over only about 15 hands,, villain is moderately loose-passive. I'd estimate about a 30 VP$IP. Limps a lot of Ax suited, pocket pairs, but also some ugly broadways (JTo from MP with no limpers in front). Earlier limped with A4s, flop came AKx, and he called down bets on all streets, and won the pot. He hasn't raised PF yet and hasn't raised anyone's bet either, but did bet once with top pair on a flop that was checked to him, then check/called through.

Party Poker 1/2 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

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

Flop: (6 SB) Q[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB folds, BB calls.

Turn: (4 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: (4 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero folds.

Final Pot: 5 BB

I'm pretty sure the turn check behind was bad. I think I feared his Ax or Q crap calling down too much. Couldn't tell if he would call on a gutshot or not. I figured he was passive enough that we might check the whole hand through. If I bet the turn and he calls, do I check behind on the river? I see no value in a value bet; he wouldn't call down K high.

After the turn check, I think the river fold was easy. But maybe I'm way off.