Haley is not looking forward to spending time with her father and her stepmom at Disney Fort Wilderness when she'd much rather spend summer with her friends back in her hometown Jupiter. Her father and stepmom decide to keep a close eye on her after Haley had a seizure a few months earlier. One night Haley goes on a scavenger hunt with some new friends in the abondoned River Country waterpark, experiences her second seizure and when she gains consciousness she realises she's been transported 30ish years back to the past, when River Country was open for business.
I loved the setting of this book. It was based on an actual place so it was cool to discover its existence and a bit about its history. The contrast between the fashion and technology in the 80s and now was interesting and I liked how Haley came to appreciate the park which stored so many memories for her father. Romance was a big part of the story but it was a little dramatic seeing as it only spanned three days. The ending chapters could've had a bigger impact if there was more time to develop it. Overall, Summer of Yesterday was a fun and enjoyable story with a hint of bittersweetness.