The plot could be that the girl is on the rollercoaster for the first time. The hair tie on her wrist was given to her by her best friend who couldn't come. As the rollercoaster moves, she feels a mix of fear and excitement. And she realizes that the hair tie gives her the courage to face her fears, just like her friend always encouraged her.
There are some great fanfictions out there with this scenario. One that comes to mind is 'Rollercoaster Thrills' which focuses on the girl's adventure on the rollercoaster and how the hair tie becomes a symbol of her journey. It's a short but sweet read that really captures the excitement of the moment.
In fanfiction, a girl with a dirty hair tie on her wrist could be a sign of her being in a hurry or perhaps she's been through some sort of adventure. Maybe she was so caught up in an event that she didn't have time to clean up or change her hair tie. It could also be a unique characteristic given to her by the author to make her stand out. For example, in a fantasy fanfiction, it might be a charm that has some special power but just looks like a dirty hair tie.
The story could start with the girl going about her normal day, the hair tie casually on her wrist. Then suddenly, she's grabbed and taken away. The hair tie might play a role in her escape plan. For example, she could use it to leave a trail or as a tool to pick a lock if it's long enough and strong enough.
In a fanfiction, the girl with the hair tie on her wrist is on a solo hike. She uses the hair tie to mark the trees along the way so she can find her way back. But then she gets lost. As she tries to retrace her steps, she realizes that the hair tie is not just a simple accessory but a reminder of her own strength and she manages to find her way back to the main trail.
The hair tie on the girl's wrist in the rain could be a symbol of a past relationship. Maybe it was given to her by an ex - boyfriend, and as she stands in the rain, she is reminiscing about the good times they had. Every time the raindrop touches it, it brings back a memory.
Maybe she's a competitive swimmer. The hair tie on her wrist is from her best friend who couldn't make it to the big championship. Every time she feels tired during the race, she looks at the hair tie and remembers her friend's support, which gives her the extra boost to keep going and win the race. In the fanfiction, you could explore her friendship and her journey in the world of competitive swimming.
One possible fanfiction could be that the girl at the waterpark is a mermaid in disguise. The hair tie on her wrist is a magical charm given to her by an old sea witch. As she enjoys the waterpark, she has to be careful not to lose the hair tie, because if she does, she'll transform back into a mermaid in front of everyone. This would cause chaos and excitement among the other visitors.
There could be a fanfiction where the girl is running away from something, like a bad situation or a bully. The hair tie on her wrist was given to her by a friend who she really cares about. As she runs, she holds onto the hair tie tightly, drawing strength from it. It gives her the courage to keep running until she reaches a safe place.
One idea could be that the girl is at the bowling alley waiting for her turn when she notices a guy staring at the hair tie on her wrist. It could be a memento from someone special, like her late grandmother who used to take her bowling. This could lead to a heartwarming conversation between the girl and the guy as she shares her story.