When I play big tournaments, I usually will play the top 10 hands aggressively, depending on how many people are already in the hand will justify how much I raise. A friend of mine who cashes a lot in the 180 man tournaments tells
me that if he has aces and it's been raised to him, he just shoves all-in. Probably seeking an early double up.
I will usually limp with pairs up to JJ in any position early on and just hope to hit a set and get paid off. Or if it's a limped multi-way pot, suited connectors.
I don't try to make moves when I have an average-below average stack, I just look to double up. Sometimes opportunities come to win a huge pot. If I get a big stack, I don't just start going like a maniac, I still stick to smart poker but use my observations of my opponents to my advantage and loosen up slightly. Meaning defending my blinds more by calling a raise at the cut off with Q10 suited. Doing this with information about my opponent's playing style in mind.
Later on you can up the aggression when it gets closer to the bubble.