65s Flop Straight - Scary River

[666shooter]

Button is 57/1.54 over 65 hands. His call on the turn is worrisome and the river card scares me. I don't think checking is the right move but I think my bet screams "I don't like that card". Should I have bet 2/3 or something in that area? Sorry if this seems routine, I'm a limit convert trying to learn the ropes.

Paradise Poker No-Limit Hold'em, $0.10 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

MP1 ($10.00)
<font color="#C00000">Hero ($49.05)</font>
MP3 ($19.45)
CO ($16.01)
<font color="#C00000">Button ($24.25)</font>
SB ($24.50)
BB ($9.75)
UTG ($31.30)
UTG+1 ($29.30)
UTG+2 ($18.25)

Preflop: Hero is MP2 with 6[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.10.
UTG calls $0.25, <font color="#666666">1 fold</font>, UTG+2 calls $0.25, <font color="#666666">1 fold</font>, Hero calls $0.25, <font color="#666666">2 folds</font>, Button calls $0.25, SB (poster) completes, BB checks.

Flop: ($1.50) 8[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, UTG checks, UTG+2 checks, <font color="#CC3333">Hero bets $1</font>, Button calls $1, SB calls $1, BB folds, UTG folds, UTG+2 folds.

Turn: ($4.50) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $4</font>, Button calls $4, SB folds.

River: ($12.50) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $5</font>, Button calls $5.

Final Pot: $22.50