Preflop
With stacks this deep and in a freeroll I prefer a larger open to 3BB. 2.2BB is for later in the tournament, when stacks get shallow, and people will actually fold even to such a small raise.
Flop
I prefer to keep the initiative with strong hands and that certainly include sets even on a wet board like this. Sure someone might have flopped a straight, but thats very unlikely, and there are a bunch of other hands as well, that will pay a normal C-bet. I dont want to let this get checked through and give everyone a free card to potentially make a straight or flush. If someone raise, your hand is strong enough to call.
Turn
Since you check-called flop, which I dont really like, you obviously need to check now. Donk betting on a card, that completed a draw, would be pretty strange.
River
When he check behind turn, you pretty much have the best hand 100% of the time, and you should bet for value. You dont need to blast it, but something like half pot can certainly get called by worse.
__________________
|