Next, the girls have decided to go camping because this is a park; and I think the Ranger Girl is in flannel because she's a lumberjack and/or bisexual.
Something startles them, and the audience expects it to be a monster, but its actually the ranger whose name I don't care about, who is riding them a horse and telling them to be careful. Thanks Ranger-Forgot-Your-Name! That's good advice in a horror movie!