I read this book between 1986 and 1989 and it was part of one of the teen romance series, I'm pretty sure it wasn't a Sweet Dreams Romance, but it might have been a Wildfire or Crosswinds/Keepsake. The book is about a spoiled girl who can't live without her hairdryer and curling iron who gets talked into going camping by her best friend. The girl's brother is nicknamed Ranger Rick because he loves to be outdoors and her best friend has a crush on the brother. I'm pretty sure the heroine's name is Chelsea. The tour guide is a friend of her brother. The guide picks on her for being spoiled and clueless about camping and she hates him at first site, but of course they end up falling in love.I think she tries to run away to get home and the guide follows her in a canoe or a raft and he ends up getting injured rescuing her from getting lost in the wilderness. She has to keep him awake all night because she's afraid he has a concussion.I found someone else searching for this book on another site and they provided the following description of the cover: "The cover of the book is a photo of a blonde girl, laying on a bed of pink satin with a white phone twirled around her finger. she is wearing white trouser pants and a hot pink/white striped sweater." Thanks for your help.
To help her best friend, Sandy, in pursuing her brother, Rick, petite, blond Chelsea Ann Hyatt, a lover of the soft life, considers taking a rafting trip down the Colorado River.