KK with ace on the flop in 10NL

[littlefinger]

Villain seemed to be a decent player; maybe calling a down bit lightly yet getting the money in with the best hand. Should I have bet the turn? I think my call on the river is quite horrible. However, at the time I was thinking how my check on the turn might have induced a bluff on the river. Any constructive criticism about my play is greatly appreciated.

Party Poker
No Limit Holdem Ring game
Blinds: $0.05/$0.10
9 players
Converter

Pre-flop: (9 players) Hero is CO with K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG folds, UTG+1 calls, MP1 calls, 2 folds, <font color="#cc0000">Hero raises to $0.6</font>, 3 folds, UTG+1 calls, MP1 folds.

Flop: A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img] ($1.45, 2 players)
UTG+1 checks, <font color="#cc0000">Hero bets $1</font>, UTG+1 calls.

Turn: 7[img]/images/graemlins/spade.gif[/img] ($3.45, 2 players)
UTG+1 checks, Hero checks.

River: 3[img]/images/graemlins/spade.gif[/img] ($3.45, 2 players)
<font color="#cc0000">UTG+1 bets $2.1</font>, Hero calls.

Results:
Final pot: $7.65
<font color="#ffffff">UTG+1 shows 9s Qs </font>
<font color="#ffffff">Hero doesn't show Ks Kc </font>