River Play?

[MrG]

Party Poker 0.50/1 Hold'em (9 handed)

Preflop: Hero is MP2 with 5[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img]. UTG+1 posts a blind of $0.50.
UTG folds, UTG+1 (poster) checks, MP1 folds, Hero calls, MP3 calls, CO folds, Button folds, SB completes, BB checks.

Flop: (5 SB) K[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="blue">(5 players)</font>
SB checks, BB checks, UTG+1 checks, Hero checks, MP3 checks.

Turn: (2.50 BB) T[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
SB checks, BB checks, UTG+1 checks, <font color="CC3333">Hero bets</font>, MP3 folds, SB calls, BB calls, UTG+1 folds.

River: (5.50 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">SB bets</font>, BB calls, Hero folds.

Final Pot: 7.50 BB
<font color="green">Main Pot: 7.50 BB, between SB and BB.

Having read SSH, I am trying to make sure I have good reason to fold the river. Here was my thinking,1) I have to beat two opponents not one 2) a 7BB pot is not large 3) I see no real st8 or flush draws either player could be chasing. Comments on all streets appreciated.