Good topic, this.
The obvious answer is A, and almost instinctively I started to write about how I love having a whole park to myself... but then I thought about it a bit, and I'm not sure it's true.
As
@Sandman said, me and him had free run of Toverland last season, and if it wasn't for the fact that Troy didn't open til lunchtime we would have smashed the whole park in an hour, including rerides. Now as good as that sounds, I gotta say as a park experience, it did feel kinda... what's the word? Kinda... 'flat'. We had a whole day to kill, what were we gonna do for the rest of the afternoon? As it turned out, on that occasion the answer was to find the nearest coffeeshop and get battered, but that's not the point. The point is it would have been quite nice to have to wait 1 or 2 trains for the coasters, instead of just strolling up and picking a seat. In fact, it would have been nice to have seen at least one other guest in the park!
To cut a long story short; B.