I would anticipate the following items, and then start breaking them down one at a time....
Mileage (your gas mileage) and how far you will travel.
Campground fees (roughly $7-$10/ night
Food / day
Entertainment? (a movie, museum etc...)
A couple nights in a hotel to get a better nights sleep...
Then I would get roadside assistance from AAA or some other source, and set aside a couple hundred just in case you blow a tire or need some other mechanical work.
I would think if you went through these one by one, you would be pretty close on your estimate.
Yes it's fast, no you can't ride it.