I don't like much call/fold questions, so thoughts on all streets are welcome. Especially river, though .

Opponent is not a regular, and I didn't see him do anything out of the ordinary. He seems to be on a passive side, likes to limp call, stats are 40/9. It seems that he has a tendency to bet bigger with good hands and smaller with bad ones.
(I am OTB and he is on BB, to simplify reading the hand history.)

Seat 1: Hero ($908.40 in chips)
Seat 3: juvefan11 ($652.70 in chips)
Seat 5: bergen75 ($623.60 in chips)
Seat 10: HaltPolizei ($1,357.55 in chips)
ANTES/BLINDS
juvefan11 posts blind ($3), bergen75 posts blind ($6).

PRE-FLOP
HaltPolizei folds, Hero bets $16, juvefan11 calls $13, bergen75 calls $10.

FLOP (48):
juvefan11 checks, bergen75 checks, Hero bets $37, juvefan11 folds, bergen75 bets $74, Hero calls $37.

TURN (196):
bergen75 bets $100, Hero calls $100.

RIVER (496):
bergen75 bets $275, Hero?

Thoughts on all streets are apreciated.
(I always raise smallish preflop and it works for me. Folding to flop minraise is not a very good idea as it could mean anyhing, even K4s.)

Its alot easier to make thin calls, thats why most people lose money. They call too much to see results. They just want to see what they lost to.