I see everyone is talking about playing based on whether its early on or late in the tourney. But from my limited experience, its not the timing in the tournament that should influence how you play more so than your stack size relative to the stack sizes of everyone else at your table.
Players with a smaller stack size seem to play a lot tighter and when your in position with a larger stack you can play LAG and get take a lot of those tight players off their
hands, because they always have more to lose than you when they make their bets.
I only play TAG when im short stacked or everyone is sitting close to the average stack level.