Playing w/ a big stack (we'll say 60BB+?) in tournies is a lot harder than most ppl think. There really are a lot of marginal situations you can find yourself in because you can open up your range w/ a lot of hands.
Early stages of tourney - most other stacks are going to be fairly deep as well so I usually stick to a pretty standard TAG game and try to avoid other big stacks unless they're spewing.
Mid/late stages - when antes start to come in and the average stack size starts droppin, thats when you should start opening a little more, especially from late position. It's key to note what size stacks are on your left and what they are capable of. (15-20BB stacks lookin to resteal in blinds).
On the bubble is where you should open up even more, especially against those opponents that are just trying to make the money and who will fold 95% of their hands in the blinds just to make it ITM.
Another basic strategy I try to use early on in tourneys is playing 'small ball poker' and seeing a lot of implied odds
type hands in position (small pps, suited connectors, etc) hoping that a big stack will overvalue TP or an OP when you hit.