PP 15/30 how should I have played this?

[BurnsvilleCardClub]

Pretty nice PP 15/30 the other night- Wondering how I could have played this better......

Hero is UTG+1 with 7 [img]/images/graemlins/club.gif[/img],7 [img]/images/graemlins/spade.gif[/img]
Hero raises, folded to UTG+3 who 3 bets it
C/O calls, button folds, blinds fold- 3 way flop
flop= A [img]/images/graemlins/spade.gif[/img] A [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/heart.gif[/img]
Hero checks, UTG+3 bets, C/O calls, Hero calls
turn: 9 [img]/images/graemlins/club.gif[/img]
Hero checks, UTG+3 bets, C/O folds, Hero calls
River: Q [img]/images/graemlins/heart.gif[/img]
Hero bets out, UTG+3 raises, Hero 3 bets, UTG+3 calls

what would you guys put UTG+3 on in this situation? and how do you think I should have played this?