River play..

[Dankenstein]

PokerStars 0.10/0.20 Hold'em (10 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with 4[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img]. MP3 posts a blind of $0.10.
<font color="#666666">3 folds</font>, MP1 calls, MP2 calls, MP3 (poster) checks, Hero calls, Button calls, <font color="#666666">1 fold</font>, BB checks.

Flop: (6.50 SB) Q[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
BB checks, MP1 checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">MP3 raises</font>, Hero calls, Button folds, BB folds, MP1 calls, <font color="#CC3333">MP2 3-bets</font>, <font color="#CC3333">MP3 caps</font>, Hero calls, MP1 calls, MP2 calls.

Turn: (11.25 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
MP1 checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">MP3 raises</font>, Hero calls, MP1 calls, MP2 calls.

River: (19.25 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
MP1 checks, MP2 checks, <font color="#CC3333">MP3 bets</font>, Hero ....

Basically I have 2 questions for this hand.
First should I be calling the turn as played ? or 3-bet ? I had very little reads on my opponents and was afraid that it would be spewy considering all the flop action. Is that legit ?
My main question is the river. Is raising an option here ? or am I calling almost every time here unless a strong read indicates otherwise ?
Sorry if this seems like easy/standard reasoning for most just want to make sure that my reasoning is correct.