NL400 AK on static board

[RapidLearner]

Villain has a really dumb all-caps username and is a complete unknown. Hero is playing a 15/9 TAG, but in villain's view I am most likely a complete unknown as well (if he's even thinking about it).

On the flop, the board is so static that a 3/4+ pot bet seems to only get called by better hands. I was looking to get called by pocket pairs and weaker kings, or possibly get check-raised by a frisky unknown. This would be my standard bet with my range on this board. Who bets more here, and why? Does anybody check here, planning to bet the other two streets?

The worst possible card comes out on the turn, so I check behind for pot control. I don't see a lot of hands that are beating me folding, nor do I see a lot of hands that are losing to me calling, so I check. Does anybody bet here, and why?

On the river, obviously the minimum I'm doing is calling. Does anybody raise as their default play? Why?

Full Tilt Poker, $2/$4 NL Hold'em Cash Game, 7 Players
LeggoPoker.com - Hand History Converter

BB: $304.10
UTG: $400
UTG+1: $560.20
MP: $71.10
CO: $402
Hero (BTN): $449
SB: $424.50

Pre-Flop: A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
UTG folds, UTG+1 calls $4, 2 folds, <font color="red">Hero raises to $18</font>, 2 folds, UTG+1 calls $14

Flop: ($42) K[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (2 Players)
UTG+1 checks, <font color="red">Hero bets $24</font>, UTG+1 calls $24

Turn: ($90) Q[img]/images/graemlins/diamond.gif[/img] (2 Players)
UTG+1 checks, Hero checks

River: ($90) 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">UTG+1 bets $4</font>, Hero ... <font color="red"> </font> <font color="red"> </font>