The play looks good, after he donk called the flop and check raised the turn he is either completely full of it or has you in really, really bad shape.

Expect to see 2 pair or a set almost everytime here against your average micro player, no idea why he checked the river I would check behind though he may be full of it but if he is he probably isn't calling with a worse hand here.

I think you need some reads on your opponent to have a better idea if he is capable of doing this with air.

That river is really odd, sometimes fish confuse so much they appear absolutely brillant!