What is your river line and why?

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($400)
UTG ($227)
MP ($326.45)
CO ($152)
Button ($96.35)
SB ($571.80)

Preflop: Hero is BB with 3, 2.
UTG calls $4, MP calls $4, CO calls $4, 1 fold, SB completes, Hero checks.

Flop: ($20) 2, 3, 7 (5 players)
SB checks, Hero bets $16, UTG folds, MP calls $16, CO folds, SB folds.

Turn: ($52) 5 (2 players)
Hero bets $32, MP calls $32.

River: ($116) 7 (2 players)
Hero?