How do you play a very early big stack?

I was in an SNG a while ago and the first hand I look down to find pocket aces in the sb. There is a ton of action until it gets to me where I push all in and am called by one person. I win and by the second hand I am chip leader with 4200 chips!

Now what I was wondering is if this advantage would make a normally tight player become aggressive in the early rounds or would you just sit back on your chip lead?

Any comments or ideas would be very helpful because I want to know if I made the right decision.