Aces full vs semi scary board

[JDErickson]

Live 4/8 game at Tuscany in Vegas.

Opponent here is either semi drunk or craves action. He has shown down river bluff raises with nothing and is losing quickly. He has me covered.

I get AA in EP and raise. folded to villain in BB who calls.

Flop AK5 rainbow. Villain checks, I bet, villain Cr's, I 3 bet, he caps.

Turn 5
Villain checks, I bet, villain throws 8 chips in and then says raise (I cry while dealer tells villain he can not raise).

River K
Villain bets, Hero ?????

At this point I have approx 4 bets left. How far do I go on this board?