Until the first break I will play very very tight and never make a stack decision unless I know I'm at least 65% ahead. When the donks leave and the antes rise, that's when the pots begin to be worth fighting for, so I wide my range and start playing more suited connectors, broadways, small pocket pairs, etc. From then on it's like any other tournament and I take bigger risks.
The next phase is the Bubble. Here it depends on the kind of freeroll. If it's a satellite that offers tickets to, say, the first 200 players, then I'll be conservative, avoid stack decisions, and play tight. As a short stack I'll wait for a big while unless I have a Premium hand. As a medium-stack I'll also only play Premium hands and avoid getting to much action. And as a big stack I'll wide some of my range, but it's still a very tight and passive kind of play. The goal is simply to get into that 200 field.
If the tournament offers money to a few entrants, then I'm much more aggressive. As a short stack I'll go all-in by the book, even if the hand isn't that big, as a medium stack I'll push short stacks around and take some risks, and as big stack I'll put as much pressure as I can on the short/medium stacks around me and be pretty aggressive with both good hands and bluffs.
That's if I REALLY REALLY want to win a freeroll. If I'm just "meh", I'll shove at the first chance I have and try to double up soon. If I go out, means nothing, and if I win, then I might consider getting concentrated on the tournament.
Good luck at the tables!!!