Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $137.65
UTG+1: $50
CO: $72.10
Button: $47.50
SB: $53.50
Hero: $97.20

Pre-flop: (6 players) Hero is BB with 6 7 5 K
UTG, folds, UTG+1 (poster) checks, 3 folds, 3 folds, Hero (poster) checks.
Uncalled bets: $0.5 returned to Hero.

Flop: 5 6 K ($0.75, 2 players)
Hero bets $1.25, UTG+1 raises to $5, Hero calls.

Turn: 5 ($10.75, 2 players)
Hero checks, UTG+1 bets $11.25, Hero calls.

River: 3 ($33.25, 2 players)
Hero checks, UTG+1 is all-in $33.25, Hero

I don't know why i am playing this passive. Push turn? Fold river?

Meh,

I don't mind your action. Since the villain has exactly two pot bets remaining and the board is draw heavy, letting him control the betting is fine, because it keeps his bluff range + overplayed draw range alive. You could choose to lead the turn, but then you will likely fold out the super-draws that could have raised the flop and only keep the set ranges alive (it's nice to have him show up with a hand like [56A x ], but bleh).

The bottom line is since you are two pot bets from the villain being allin and he has the betting control, just go into calling mode to allow his range to include bluffs and draws (turn check-raise is fine if you feel he is incapable of 3-barreling).

You'll note I'm not really discussing the possibility that he has you beat. The simple reason is that since you have the deck crippled for the necessary winning sets, I don't think I am capable of laying this down within the two pot bets of action remaining before the villain is allin.

UTG+1 posts a blind so it's his first hand? if I'm seeing this right?

I think the turn is probably more a push than check. He has control of the betting but how certain are we that he will fire with any river card? I think it's better to try and get the money in on the turn with the drawy board and with almost 40% of his stack already committed.

If you're calling the turn, you're calling the river.

folding turn is an option?

On the turn, villain is most likely betting when checked to because his raise on the flop represented a set (even though he may have had a draw). Because of this, your check on the turn is correct, and I think you have to call his bet. On the river, I don't really see why you checked. You may as well bet and hope to get a call from a flush, since I don't think he will continue to bluff the river (or bet a flush for value). I would probably bet 1/2 the pot.

The only reason I see to check river is if you're considering making a fold. So there are 3 hands that have you beat (KK,66,and55) and 2 combos of K5 that represent a chop. That means you only have .20 equity if he has what he is supposed to have - the question is whether the "donk factor" bumps this amount up to the 33% you need to make the call. I think vs. an unknown, it does, and you should call.