AKs early in FTOPS #7

[Bob1Preston]

Still fairly early in FTOPS #7, so no definitive reads. However the villain has seemed to play TAG/TP, according to PAHUD (don't recall his VPIP, etc.) and from my own observations. I did pokerdb him and he had played 64 tournaments, w/ an average buyin of $90, and ROI of 25% so not a complete donkey by any means. I would say that my image at the time was probably along the same lines as his, but probably more so TAG than TP.

Full Tilt Poker, NL Hold'em Tournament, 30/60 Blinds, 8 Players

SB: 4,595
BB: 3,835
UTG: 3,055
UTG+1: 3,770
Hero (MP1): 3,000
MP2: 2,275
CO: 7,550
BTN: 1,920

Pre-Flop: (90) A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (MP1)
UTG calls 60, UTG+1 folds, <font color="red">Hero raises to 240</font>, 5 folds, UTG calls 180

Flop: (570) K[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets 400</font>, UTG calls 400

Turn: (1,370) J[img]/images/graemlins/heart.gif[/img] (2 Players)
UTG checks, Hero checks

River: (1,370) 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">UTG bets 720</font>, Hero ???

My primary question is obviously whether to call or fold on the river, as I feel as though I played pretty optimally against this type of player's range. However, any suggestions, whether it be actions or bet sizes, on previous streets are appreciated as well. Thanks.