Late stage tournament play is quite complicated because the payouts impact every decision. My usual strategy is to play position, cultivate a tight image, pick on players who have medium size stacks and avoid tournament risking confrontations unless I have a very short stack or a near nut hand. I try to avoid the better players and play POKER against the ones I can manipulate into giving me their chips. Finally, I play agressively; I almost never call.
When you get near the final couple of tables many players will be playing with less than 15 BB, so expect a shove fest. Try to stay out of the action in this stage unless you have a very good hand, especially if you are not in late position.
Pay attention to the payout structure. Do not risk your stack at a payout change without a very big hand; somebody will likely go out in 2 or 3 hands anyway.
Avoid calling with speculative hands unkess you have very good implied odds
When you do play a hand play it carefully but agressively.
Continue to steal blinds. Using the smallest bet that will induce a fold from the players behind you. (sometimes that is a shove)