Flop a set heads up

[sMethod]

Opponent had a big vpip at the moment but iv only seen like 20 hands with him so almost totally unknow, seemed loose.

Is this the best line with this hand? what do you think about trying to check raising the turn for information? As played call or fold on river?

Poker Stars - No Limit Hold'em Cash Game - $1/$2 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $267.10
BB: $200.00
Hero (UTG): $195.65
CO: $305.65
BTN: $199.00

Preflop: Hero is dealt 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] (5 Players)
Hero calls $2.00, <font color="red">CO raises to $6.00</font>, 3 folds, Hero calls $4.00

Flop: ($15) 6[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $14.00</font>, CO calls $14.00

Turn: ($43) J[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $34.00</font>, CO calls $34.00

River: ($111) 3[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $100.00</font>, Hero?