Interesting $1/2 hand

[elnino12]

This table is somewhat tight, and pretty passive. Villain to my right is tight aggressive but capable of making some tricky moves. Hero has ~$350, Villain ~$200, MP3 ~$50

MP1 raises to $4, MP3 calls, CO calls, Villain in SB calls, Hero calls in BB with 3 [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img]

FLOP ($18): 4 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] 3 [img]/images/graemlins/heart.gif[/img]

Villain checks, Hero bets $12, MP1 folds, MP3 calls, CO folds, Villain calls

TURN ($54): 9 [img]/images/graemlins/club.gif[/img] Villain checks, Hero bets $32, MP3 folds, Villain calls

RIVER ($108): 4 [img]/images/graemlins/diamond.gif[/img] Villain bets $50 and has about $100 left behind...Hero does what?

I honestly don't think Villain was bluffing at a missed draw, but I did think he might have a higher boat than me. There's probably no way I'm folding this, so do I just call, minraise, or push? Also, is there anything you'd recommend that I do differently on any other streets? Thanks in advance for the feedback.

-Nino