Easy 400 Max hand? Fold the river or call?

[JasonP530]

Sat down a few orbits ago at the 2/4 400 Max game online. Won a few pots and am at ~520, but the opponent only has 300 or so. He has pretty passive stats through 50 hands or so(like .3 agression after the flop), but no reads.

3 limpers to me and I limp with 66. Blinds call and we are off to the races.

Flop is a gorgeous JT6 with the JT of spades. Everyone checks to me, and not wanting to give a free card on a dangerous board, I fire $20(the pot). All fold back around to Villian who calls.

Turn is a 2, and he quickly checks. I felt like he was on a draw, so I fired the full pot again($60), and he calls.

The river is a Q(not spade). He thinks and bets $100 into me. The pot was $180 on the turn and he has around $120 left.

Call or fold? What do you think of the full size pot bets on that board instead of my normal 3/4 or so?

Thanks,
Jason