Strategy advice: Need to finish top 5 out of 20

[DrCool]

The particulars: Local cardroom has a Aces cracked free entry tourney. If you get Aces cracked you get a free entry into a tourney. Every week there are 3 preliminary tourneys. Top 3 from each of those go to the final table for the week. Top 2 from there go on to the semi-finals. This is where I am at now.

The semi-finals will be 2 20 person tournaments. Top 5 from each of those go on to the final table. Winner gets $10K. Nothing for second place. It is being billed as "win an entry into the WSOP" type of thing but they are just gonna pay out $10K and let the winner do what they want with the money. Chip counts don't carry over either.

What would the best strategy be to finish top 5 out of 20? I don't care if I only have 1 chip at that point or a huge stack. Just need to finish top 5.

Should I play super aggressive and try and build a stack early since everyone else will be thinking if they just play super, super tight they can eek into the top 5?

Should I play super, super tight and hope everyone else is playing super loose?

Obviously I will need to make some determination as to how I should play when I see what everyone else is doing but in general how would you play this?