unless I am very much mistaken, I believe you are talking about the story by KrlyB and his character Erica. That first story about the waterpark started off a whole series of adventures as she went through highschool and college. You can find the complete chronicles here:
http://groups.yahoo.com/group/erica_chronicles/
The "Worst Day of My Life" story is the first one in the file section at the group.
Hope that helps.