How do you play this river?

[iceman5]

$2/$5 NL..Live game.

I just sat down with my $500. Ive watched 3 hands. I raise to $20 with AK of hearts. BB calls. Hes got about $400 or so and looks like an idiot. Covered with tatoos.

Pot $40. Flop AT4 with one heart. He leads for $20 and I call.

Pot $80. Turn 6. he bets $20 and I raise to $70 which he calls.

Pot $220. River 3h. How do you play these 3 scenarios?

1) He checks (most likely)
2) He bets $100
3) He bets $5...lol...this is what he actually did.