Best thing you can do for a track day (if available), is to buy some time with an instructor. (More useful than an extra 100 bhp, IMO).
I agree with DH on most things:-
I would run lower than normal tyre pressures, as the air expands when it gets hot. (You may also want to have the fronts a couple of psi lower than the rears, to kill a fraction of understeer.
I would also remove as much (easy) dead weight as you can; rear bench, parcel shelf, spare wheel, tools etc. as the more weight you carry, the harder it is on your brakes.
Don't forget to do a full cooling down lap if possible (if not, drive around the car park) before you park up & be as light as you can on the brakes during this. Leave the car in gear & remember to leave the handbrake OFF when you switch off, as hot rear pads sometimes have a nasty habit of binding themselves to the discs!
Change the oil/filter before you go & top up to the MAX marker, as you don't want any mid-corner oil starvation!
Change the brake fluid before & after the day. On the change before yo go, leave the level at about 25-50% between the min/max marker.
p.s. Yes, you want some good meat on the pads to absorb the heat, but don't run brand new pads.