Party 100NL A9s flops trips

[Spellmen]

Villain is 27/9 after 30 hands. He seems very calling stationish, called down with 67o against pf raiser on a 557 board even after turn and river came J9. Is my check terrible in the bb? Looking back I probably should have raised it but was multitabling and I tend to get a little more passive with weaker holdings. How is my river check? I thought about bet/folding, but I am pretty uncomfortable with that because I will tend to make bad calls then.

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
10 players
Converter

Stack sizes:
UTG: $100
UTG+1: $100
UTG+2: $101.84
MP1: $157.70
MP2: $111.47
MP3: $205.93
CO: $47.74
Button: $93.35
SB: $99
Hero: $100

Pre-flop: (10 players) Hero is BB with 9[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img]
UTG (poster) checks, UTG+1 folds, UTG+2 calls, 3 folds, CO (poster) checks, 2 folds, 2 folds, Hero (poster) checks.

Flop: 9[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/diamond.gif[/img] ($4.5, 4 players)
<font color="#cc0000">Hero bets $3</font>, UTG calls, 2 folds.

Turn: 6[img]/images/graemlins/club.gif[/img] ($10.5, 2 players)
<font color="#cc0000">Hero bets $7</font>, UTG calls.

River: T[img]/images/graemlins/diamond.gif[/img] ($24.5, 2 players)
Hero checks, <font color="#cc0000">UTG bets $30.33</font>.
Hero folds?

Results:
Final pot: $24.5

This river overbet is almost always a hit draw right? Bump up the flop and turn bets as well? I usually will bet right under pot size, like 4 flop and then 11 or 12 turn but didn't here.