It is definitely off kilter for Plano. I was born and raised here, and grew up in the neighborhood that shares a property line with the preserve. I know it VERY well. I just happened to move back to the area after school because my office is nearby.
Plano is kinda in a weird place right now, it's not as tight knit as it used to be. With Toyota almost finished with their new headquarters a few blocks away, and with all the new businesses moving here, there has been a lot of growth. They said that over 12,000 new jobs are going to be opening up in Plano in the next 5 years. So there are literally thousands of families moving here. The area around Arbor Hills is very "well to do" if you will. Lots of money over there. Lots of company headquarter (JC Penny, Boeing, Dallas Cowboys, Toyota, Dr. Pepper etc). Huge houses on all sides of the park with at least 3 complexes that I can think of. And it is within a short drive between 3 major tollways that can get you anywhere.
As far as the park goes, it has also changed quite a bit. It's the only real outdoor "hiking and biking" space on the west side. As a kid I used to play in the creeks make new trails all the way to the railroad tracks in the back on the park. Now, like one of the reports said, there inst really a hiding place in the park. It has been so beaten down and over hiked that there are literally trails that crisscross the entire park. The city has a hard time keeping up with erosion. They close a trail to help it regrow, but people go around it. There really isn't anything remote about it anymore, that place has been pretty well mapped out by trails. It is very beautiful though.
There are 2 official entrances to the park, but a few unofficial ones as well. Three sides of the park are surrounded by very tall chain link fence. The main entrance opens up to the neighborhood it is connected to where you can either go through the parking lot, or walk across the field from the neighborhood. I know there are cameras at the main entrance. I am not sure about the neighborhood side, it has been a while since I have been that way. But I know that if you park your car in the neighborhood at night and walk to the park, the police will come find you. The neighbors ALWAYS call for cars they don't recognize. As for the unofficial entrances, I know of at least 3 holes in the fence on The Colony side of the park that allow access to those who live in the apartment complexes. They aren't sketchy holes that some naughty kids made, but you can tell from the VERY worn trails in and out of them that the people who live in the complexes use them to take their dogs out and have been for years. As far as I know, those entrances are not monitored. But that's probably why there were people still in the park when it was "closed" for their investigation. The city hasn't made much of an effort to close the fence entrances as far as I have seen, besides old no trespassing signs.
As far as my opinion of the park, I could bet money that there were still a lot of people there when she was there, even at night. There are some bluebonnets in the field by the parking lots every year, and I bet there were families finishing up Easter pictures that night. I believe most kids were off school. So it would have been a very busy day at arbor hills. There is lighting in the parking lots, but if you are on the trails it is very dark. But they are well marked, and you wont go very far on a dirt trail without running into the concrete trail, which makes it very hard to get lost. You are never too far away from a sign or a main trial. I don't mind going there alone, and I wouldn't be afraid of going at night as long as I had my dog with me. I have never been scared of people as much as the wildlife. LOTS of snakes. At 8:30 I would probably be on my way back to my car, since the sun had just gone down and it was starting to get harder to see, but I wouldn't be frightened to be out there. Like I said, I'm pretty sure she wasn't alone out there, there were probably still lots of people around in the picnic areas and such. I don't think the gate closes till 9:30, but I could be wrong. I'm sure she had been out there many times before, she was obviously at ease by walking and talking on the phone.
It's just really scary. First Christina Morris, now this. I don't like it.
Also, I havent figured out how to quote people yet, so my bad.