It's the last day of high school.
And that's all you have to say for me to read your book. From What I Remember... has some terrible lines so cringe-inducing it's like a real teenager said them. So, plus one for authenticity. But also minus one for terrible lines.
This book is pretty standard last of high school fare. Valedictorian is an uptight scholarship student who always wears her hair back. A series of unbelievable events put her in Ensenada with the star rich jock of their posh private school when they should be home partying and/or taking care of their responsibilities. The girl lets her hair down, the guy proves he's not a complete idiot, and the two fall in love. Also, there is a funny queer bff and a mean girl who isn't so bad after all. It's kind of a less-smart version of Nick and Norah, and anyway it's silly and I liked it.