Fire Island (Keri Series, #2)

Keri Walker is 12 years old and is in a bit of strife. She has been on the end of some bullying from The Gang of Five and she's keen to make herself scarce when they are around. However, she can't help but step in when she finds a much younger child being bullied.

The Gang of Five thinks she snitched on them. On a school camp, they start a serious campaign. The camp is on an island, and there are plenty of exciting activities to look forward to; yachting, confidence course and orienteering. ...