Calabogie Motorsports Park... should I go or not?

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Here is the deal,

I've been a car nut for ever and had my share of fast cars.
I've been drag racing since 1994. I've always wanted to try out a lapping event but never made it to one.
Well, this year, my wife decided to register me for a lapping day @ Calabogie Motorsports Park so I can my racing fix!
This is a fairly new track (3 years I think) and is very close to home.
I was very excited when she gave me the news but now I'm a bit hesitant.
I'm sure I can handle my Focus ST on that track, but it mught be overwhelming.
I have not done much to my car except Steeda SRI and Focus Sport upper front stress bar.
I will be getting the "Track Orientation" which is an extra 50$. They also suggest I get an instructor since I have very limited experience, but at an extra 150$!!!
This is starting to be quite expensive. I'm just not sure anymore. I know I won't be going nuts, but don't want to hold back other attendees on the track.

Any suggestions for a first timer? My car has about 37K miles on its brakes... should I change them before track day? Do I run with full tank of gas, half, 1/4?

Thanks for all your input

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