What would the optimal play be here?
PokerStars No-Limit Hold'em, $0.50 BB (7 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

saw flop | saw showdown
BB ($19.50)
UTG ($30.20)
MP1 ($9.25)
MP2 ($24.05)
Hero (CO) ($31.85)
Button ($19.25)
SB ($31.75)

Preflop: Hero is CO with 8
, 8
UTG calls $0.50, 2 folds, Hero bets $2, 1 fold, SB calls $1.75, BB calls $1.50, UTG calls $1.50
Flop: ($8) 8
, 6
, 3
(4 players)
SB checks, BB checks, UTG checks, Hero bets $3, 2 folds, UTG calls $3
Turn: ($14) 2
(2 players)
UTG bets $1, Hero raises to $7, UTG calls $6
River: ($28) A
(2 players)
UTG bets $1, Hero calls $1